diff --git a/packages/theme/styles/common.scss b/packages/theme/styles/common.scss
index bc8ce8e2aa..a252ac9c73 100644
--- a/packages/theme/styles/common.scss
+++ b/packages/theme/styles/common.scss
@@ -63,7 +63,7 @@
   max-width: 17.5rem;
   width: 17.5rem;
   background-color: var(--theme-navpanel-color);
-  border-right: 1px solid var(--theme-navpanel-border);
+  // border-right: 1px solid var(--theme-navpanel-border);
 }
 @media (max-width: 1024px) {
   .antiPanel-navigator {
diff --git a/packages/ui/src/components/Panel.svelte b/packages/ui/src/components/Panel.svelte
index 8477f0650c..5dbeb696aa 100644
--- a/packages/ui/src/components/Panel.svelte
+++ b/packages/ui/src/components/Panel.svelte
@@ -14,10 +14,17 @@
 -->
 <script lang="ts">
   import { afterUpdate, createEventDispatcher, onMount } from 'svelte'
-  import { deviceOptionsStore as deviceInfo, checkAdaptiveMatching, IconBack } from '../../'
-  import { resizeObserver } from '../resize'
-  import Button from './Button.svelte'
-  import Scroller from './Scroller.svelte'
+  import {
+    deviceOptionsStore as deviceInfo,
+    checkAdaptiveMatching,
+    IconBack,
+    Separator,
+    defineSeparators,
+    resizeObserver,
+    Button,
+    Scroller,
+    panelSeparators
+  } from '../../'
   import IconClose from './icons/Close.svelte'
   import IconDetails from './icons/Details.svelte'
   import IconMaxWidth from './icons/MaxWidth.svelte'
@@ -82,6 +89,8 @@
   })
 
   onMount(() => dispatch('open'))
+
+  defineSeparators('panel-aside', panelSeparators)
 </script>
 
 <div
@@ -210,6 +219,7 @@
       </div>
     {/if}
     {#if $$slots.aside && isAside && asideShown}
+      <Separator name={'panel-aside'} index={0} />
       <div class="popupPanel-body__aside" class:float={asideFloat} class:shown={asideShown}>
         {#if moveUtils}
           <div class="buttons-group justify-end xsmall-gap" style:margin={'.5rem 2rem 0'}>
diff --git a/packages/ui/src/components/Separator.svelte b/packages/ui/src/components/Separator.svelte
new file mode 100644
index 0000000000..1186f4df85
--- /dev/null
+++ b/packages/ui/src/components/Separator.svelte
@@ -0,0 +1,473 @@
+<!--
+// Copyright © 2023 Hardcore Engineering Inc.
+//
+// Licensed under the Eclipse Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License. You may
+// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//
+// See the License for the specific language governing permissions and
+// limitations under the License.
+-->
+<script lang="ts">
+  import { afterUpdate, onDestroy, onMount } from 'svelte'
+  import type { TSeparatedItem, SeparatedItem } from '..'
+  import {
+    nullSeparatedItem,
+    deviceOptionsStore as deviceInfo,
+    getSeparators,
+    saveSeparator,
+    SeparatedElement
+  } from '..'
+
+  export let prevElementSize: SeparatedItem | undefined = undefined
+  export let nextElementSize: SeparatedItem | undefined = undefined
+  export let separatorSize: number = 1
+  export let color: string = 'var(--theme-navpanel-border)'
+  export let name: string
+  export let index: number // index = -1 ; for custom sizes without saving to a localStorage
+
+  const direction: 'horizontal' | 'vertical' = 'horizontal'
+  let separators: SeparatedItem[] | null = null
+  let separatorMap: SeparatedElement[]
+  let prevElSize: SeparatedItem
+  let nextElSize: SeparatedItem
+  let separator: HTMLElement
+  let prevElement: HTMLElement | null
+  let nextElement: HTMLElement | null
+  let mounted: boolean = false
+  let isSeparate: boolean = false
+  let excludedIndexes: number[] = []
+  let correctedIndex: number = index
+  let offset: number = 0
+  let separatorsSizes: number[] | null = null
+  const separatorsWide: { start: number; end: number; total: number } = { start: 0, end: 0, total: 0 }
+  const containers: { minStart: number; minEnd: number; maxStart: number; maxEnd: number } = {
+    minStart: -1,
+    minEnd: -1,
+    maxStart: -1,
+    maxEnd: -1
+  }
+  let parentSize: { start: number; end: number; size: number } | null = null
+
+  const fetchSeparators = (): void => {
+    separators = getSeparators(name)
+    prevElSize = separators !== null ? separators[index] : nullSeparatedItem
+    nextElSize = separators !== null ? separators[index + 1] : nullSeparatedItem
+  }
+  $: if (name) {
+    fetchSeparators()
+    if (prevElementSize !== undefined) prevElSize = prevElementSize
+    if (nextElementSize !== undefined) nextElSize = nextElementSize
+    checkSizes()
+  }
+
+  $: fs = $deviceInfo.fontSize
+  const remToPx = (rem: number): number => rem * fs
+  const pxToRem = (px: number): number => px / fs
+
+  const convertSize = (prop: TSeparatedItem): string => (typeof prop === 'number' ? `${prop}px` : '')
+
+  const setSize = (element: HTMLElement, size: TSeparatedItem, next: boolean = false): void => {
+    const s = convertSize(size)
+    if (direction === 'horizontal') {
+      element.style.minWidth = size === 'auto' ? '0' : s
+      element.style.maxWidth = s
+      element.style.width = s
+    } else {
+      element.style.minHeight = size === 'auto' ? '0' : s
+      element.style.maxHeight = s
+      element.style.height = s
+    }
+    const sizePx = direction === 'horizontal' ? element.clientWidth : element.clientHeight
+    element.setAttribute('data-size', `${sizePx}`)
+    if (separators) separators[index + (next ? 1 : 0)].size = pxToRem(sizePx)
+    if (next) nextElSize.size = typeof size === 'number' ? pxToRem(sizePx) : size
+    else prevElSize.size = typeof size === 'number' ? pxToRem(sizePx) : size
+  }
+
+  const generateMap = (): void => {
+    const parent = separator.parentElement
+    if (parent === null) return
+    const p = parent.getBoundingClientRect()
+    parentSize =
+      direction === 'horizontal'
+        ? { start: p.left, end: p.right, size: p.width }
+        : { start: p.top, end: p.bottom, size: p.height }
+    const children: Element[] = Array.from(parent.children)
+    if (children.length > 1 && separators !== null) {
+      const elements = children.filter(
+        (el) =>
+          !el.classList.contains('antiSeparator') && (el.hasAttribute('data-size') || el.hasAttribute('data-auto'))
+      )
+      const hasSep = elements.filter((el) => el.hasAttribute('data-float')).map((el) => el.getAttribute('data-float'))
+      const excluded = separators
+        .filter((separ) => separ.float !== undefined && !hasSep.includes(separ.float))
+        .map((separ) => separ.float)
+      excludedIndexes = []
+      separators.forEach((separ, i) => {
+        if (excluded.includes(separ.float)) excludedIndexes.push(i)
+      })
+      correctedIndex = index - excludedIndexes.filter((i) => i < index).length
+      const sm: SeparatedElement[] = []
+      let ind: number = 0
+      elements.forEach((element, i) => {
+        if (separators && excluded.includes(separators[i].float)) ind++
+        const styles = new Map<string, string>()
+        const dropStyles = ['min-width', 'max-width', 'width']
+        const style = elements[i] ? elements[i].getAttribute('style') : null
+        if (style !== null) {
+          style
+            .replace(/ /g, '')
+            .split(';')
+            .filter((f) => f !== '')
+            .forEach((st) => styles.set(st.split(':')[0], st.split(':')[1]))
+          dropStyles.forEach((key) => styles.delete(key))
+        }
+        const size = direction === 'horizontal' ? elements[i].clientWidth : elements[i].clientHeight
+        if (separators) {
+          sm.push({
+            id: ind,
+            element,
+            styles,
+            minSize:
+              typeof separators[ind].minSize === 'number' ? remToPx(separators[ind].minSize as number) : remToPx(20),
+            maxSize: typeof separators[ind].maxSize === 'number' ? remToPx(separators[ind].maxSize as number) : -1,
+            size,
+            begin: i <= correctedIndex,
+            resize: false,
+            float: separators[ind].float
+          })
+        }
+        ind++
+      })
+      separatorMap = sm
+      const cropIndex = correctedIndex - excludedIndexes.filter((ex) => ex < correctedIndex).length
+      const startBoxes = separatorMap.filter((_, i) => i < cropIndex + 1)
+      const endBoxes = separatorMap.slice(cropIndex + 1, sm.length)
+      containers.minStart = startBoxes.map((box) => box.minSize).reduce((prev, a) => prev + a, 0)
+      containers.minEnd = endBoxes.map((box) => box.minSize).reduce((prev, a) => prev + a, 0)
+      containers.maxStart =
+        startBoxes.filter((box) => box.maxSize === -1).length > 0
+          ? -1
+          : startBoxes.map((box) => box.maxSize).reduce((prev, a) => prev + a, 0)
+      containers.maxEnd =
+        endBoxes.filter((box) => box.maxSize === -1).length > 0
+          ? -1
+          : endBoxes.map((box) => box.maxSize).reduce((prev, a) => prev + a, 0)
+    }
+  }
+
+  const initSize = (element: HTMLElement, props: SeparatedItem, next: boolean = false): void => {
+    const minSizePx = props.minSize === 'auto' ? '0' : convertSize(remToPx(props.minSize))
+    const maxSizePx = convertSize(props.maxSize === 'auto' ? 'auto' : remToPx(props.maxSize))
+    const sizePx = convertSize(props.size === 'auto' ? 'auto' : remToPx(props.size))
+
+    if (props.size !== 'auto') {
+      setSize(element, remToPx(props.size), next)
+      return
+    }
+    if (direction === 'horizontal') {
+      element.style.minWidth = minSizePx
+      element.style.maxWidth = maxSizePx
+      element.style.width = sizePx
+      element.setAttribute('data-auto', `${element.clientWidth}`)
+    } else {
+      element.style.minHeight = minSizePx
+      element.style.maxHeight = maxSizePx
+      element.style.height = sizePx
+      element.setAttribute('data-auto', `${element.clientHeight}`)
+    }
+  }
+
+  const checkSizes = (): void => {
+    if (prevElement) initSize(prevElement, prevElSize)
+    if (nextElement) initSize(nextElement, nextElSize, true)
+  }
+
+  const applyStyles = (final: boolean = false): void => {
+    if (separatorMap === null) return
+    const side = direction === 'horizontal' ? 'width' : 'height'
+    const sum = separatorMap
+      .filter((f) => f.maxSize !== -1)
+      .map((el) => el.size)
+      .reduce((prev, a) => prev + a, separatorsWide.total)
+    separatorMap.forEach((item) => {
+      if (item.resize || final) {
+        let style: string = `min-${side}:${
+          item.maxSize !== -1 ? item.size + 'px' : item.minSize === -1 ? '0' : item.minSize + 'px'
+        };`
+        style += item.maxSize === -1 ? '' : `max-${side}:${item.size + 'px'};`
+        style += item.maxSize !== -1 ? `${side}:${item.size}px;` : `${side}:calc(100% - ${sum}px);`
+        if (item.styles !== null) {
+          item.styles.forEach((value, key) => {
+            if (key !== 'pointer-events' || final) style += `${key}:${value};`
+          })
+        }
+        if (isSeparate) style += 'pointer-events:none;'
+        item.element.setAttribute('style', style)
+        item.resize = false
+      }
+    })
+  }
+
+  const resizeContainer = (id: number, min: number, max: number, count: number, stretch: boolean = false): number => {
+    const diff = max - min
+    if (diff) {
+      const size = min + (count >= diff ? (stretch ? diff : 0) : stretch ? count : diff - count)
+      separatorMap[id].size = size
+      separatorMap[id].resize = true
+      count = count - diff <= 0 ? 0 : count - diff
+    }
+    return count
+  }
+  const stretchContainer = (id: number, size: number): number => {
+    separatorMap[id].size = size
+    separatorMap[id].resize = true
+    return 0
+  }
+
+  function mouseMove (event: MouseEvent) {
+    if (!isSeparate || separatorMap === null || parentSize === null || separatorsSizes === null) return
+    const coord: number = direction === 'horizontal' ? event.x - offset : event.y - offset
+    let parentCoord: number = coord - parentSize.start
+    let prevCoord: number = separatorMap
+      .filter((f) => f.begin)
+      .map((m) => m.size)
+      .reduce((prev, a) => prev + a, 0)
+    for (let i = 0; i < correctedIndex; i++) prevCoord += separatorsSizes[i]
+    const startSizeMin = containers.minStart + separatorsWide.start
+    const startSizeMax = containers.maxStart === -1 ? -1 : containers.maxStart + separatorsWide.start
+    if (parentCoord <= startSizeMin) parentCoord = startSizeMin + 1
+    if (startSizeMax !== -1 && parentCoord > startSizeMax) parentCoord = startSizeMax
+    const endSizeMin = containers.minEnd + separatorsWide.end
+    const endSizeMax = containers.maxEnd === -1 ? -1 : containers.maxEnd + separatorsWide.end
+    if (parentCoord > parentSize.size - endSizeMin) parentCoord = parentSize.size - endSizeMin - 1
+    if (endSizeMax !== -1 && parentCoord < parentSize.size - endSizeMax) parentCoord = parentSize.size - endSizeMax - 1
+    const diff = prevCoord - parentCoord // + <-  - ->
+    let remains = diff
+    if (remains !== 0) {
+      const reverse = remains < 0
+      if (reverse) remains = Math.abs(remains)
+      const minusId = correctedIndex + (reverse ? 1 : 0)
+      const plusId = correctedIndex + (reverse ? 0 : 1)
+
+      const minusAutoBoxes = separatorMap.filter(
+        (s, i) => s.maxSize === -1 && ((!reverse && i < correctedIndex) || (reverse && i > correctedIndex + 1))
+      )
+      const minusBoxes = separatorMap.filter(
+        (s, i) => s.maxSize !== -1 && ((!reverse && i < correctedIndex) || (reverse && i > correctedIndex + 1))
+      )
+      const minusBox = separatorMap[minusId]
+      const startMinus = separatorMap[minusId].maxSize === -1
+      const plusAutoBoxes = separatorMap.filter(
+        (s, i) => s.maxSize === -1 && ((!reverse && i > correctedIndex + 1) || (reverse && i < correctedIndex))
+      )
+      const plusBoxes = separatorMap.filter(
+        (s, i) => s.maxSize !== -1 && ((!reverse && i > correctedIndex + 1) || (reverse && i < correctedIndex))
+      )
+      const plusBox = separatorMap[plusId]
+      const startPlus = separatorMap[plusId].maxSize === -1
+
+      // Find for crop
+      if (startMinus && minusBox.size - minusBox.minSize > 0) {
+        remains = resizeContainer(minusId, minusBox.minSize, minusBox.size, remains)
+      }
+      if (remains && minusAutoBoxes.length > 0) {
+        minusAutoBoxes.forEach((box) => {
+          if (remains) remains = resizeContainer(box.id, box.minSize, box.size, remains)
+        })
+      }
+      if (remains && !startMinus && minusBox.size - minusBox.minSize > 0) {
+        remains = resizeContainer(minusId, minusBox.minSize, minusBox.size, remains)
+      }
+      if (remains && minusBoxes.length > 0) {
+        minusBoxes.forEach((box) => {
+          if (remains) remains = resizeContainer(box.id, box.minSize, box.size, remains)
+        })
+      }
+      let needAdd: number = Math.abs(diff) - remains
+      // Find for stretch
+      if (needAdd && startPlus) needAdd = stretchContainer(plusId, plusBox.size + needAdd)
+      if (needAdd && plusAutoBoxes.length > 0) {
+        const div = needAdd / plusAutoBoxes.length
+        plusAutoBoxes.forEach((box) => (needAdd = stretchContainer(box.id, box.size + div)))
+      }
+      if (needAdd && plusBox.maxSize - plusBox.size > 0) {
+        needAdd = resizeContainer(plusId, plusBox.size, plusBox.maxSize, needAdd, true)
+      }
+      if (needAdd && plusBoxes.length > 0) {
+        plusBoxes.forEach((box) => {
+          if (needAdd) needAdd = resizeContainer(box.id, box.size, box.maxSize, needAdd, true)
+        })
+      }
+      separatorMap = separatorMap
+    }
+    applyStyles()
+  }
+
+  function mouseUp () {
+    isSeparate = false
+    applyStyles(true)
+    if (index !== -1 && separators && separatorMap) {
+      let ind: number = 0
+      const sep: SeparatedItem[] = []
+      separators.forEach((sm, i) => {
+        let save = false
+        if (excludedIndexes.includes(i)) {
+          save = true
+          ind++
+        }
+        if (save) sep.push(sm)
+        else {
+          sep.push({
+            size: separatorMap[i - ind].maxSize === -1 ? 'auto' : pxToRem(separatorMap[i - ind].size),
+            minSize: pxToRem(separatorMap[i - ind].minSize),
+            maxSize: separatorMap[i - ind].maxSize === -1 ? 'auto' : pxToRem(separatorMap[i - ind].maxSize),
+            float: separatorMap[i - ind].float
+          })
+        }
+      })
+      saveSeparator(name, sep)
+    }
+    document.body.style.userSelect = 'auto'
+    document.body.style.webkitUserSelect = 'auto'
+    document.body.style.cursor = ''
+    document.removeEventListener('mousemove', mouseMove)
+    document.removeEventListener('mouseup', mouseUp)
+  }
+
+  function mouseDown (event: MouseEvent) {
+    if (prevElement === null || nextElement === null) {
+      checkSibling()
+      return
+    }
+    offset = direction === 'horizontal' ? event.offsetX : event.offsetY
+    generateMap()
+    isSeparate = true
+    applyStyles(true)
+    document.addEventListener('mousemove', mouseMove)
+    document.addEventListener('mouseup', mouseUp)
+    document.body.style.userSelect = 'none'
+    document.body.style.webkitUserSelect = 'none'
+    document.body.style.cursor = direction === 'horizontal' ? 'col-resize' : 'row-resize'
+  }
+
+  const checkSibling = (start: boolean = false): void => {
+    if (prevElement === null || start) prevElement = separator.previousElementSibling as HTMLElement
+    if (nextElement === null || start) nextElement = separator.nextElementSibling as HTMLElement
+    if (separators && prevElement && separators[index].float !== undefined) {
+      prevElement.setAttribute('data-float', separators[index].float ?? '')
+    }
+    if (separators && nextElement && separators[index + 1].float !== undefined) {
+      nextElement.setAttribute('data-float', separators[index + 1].float ?? '')
+    }
+  }
+
+  onMount(() => {
+    if (separator) {
+      checkSibling(true)
+      const parent = separator.parentElement
+      if (parent) {
+        const elements: Element[] = Array.from(parent.children)
+        separatorsSizes = elements
+          .filter((el) => el.classList.contains('antiSeparator'))
+          .map((el) => parseInt(el.getAttribute('data-size') ?? '0', 10))
+        separatorsWide.total = separatorsSizes.reduce((prev, a) => prev + a, 0)
+        separatorsWide.start = separatorsSizes.slice(0, index).reduce((prev, a) => prev + a, 0)
+        separatorsWide.end = separatorsSizes.slice(index + 1, separatorsSizes.length).reduce((prev, a) => prev + a, 0)
+      }
+      checkSizes()
+      mounted = true
+    }
+    document.addEventListener('resize', checkSizes)
+  })
+  onDestroy(() => {
+    document.removeEventListener('resize', checkSizes)
+  })
+  afterUpdate(() => {
+    if (mounted) checkSibling()
+  })
+</script>
+
+<div
+  bind:this={separator}
+  style:--separator-size={`${separatorSize}px`}
+  style:background-color={color}
+  class="antiSeparator {direction}"
+  class:hovered={isSeparate}
+  data-size={separatorSize}
+  on:mousedown|stopPropagation={mouseDown}
+/>
+
+<style lang="scss">
+  .antiSeparator {
+    position: relative;
+    flex-shrink: 0;
+
+    &::after,
+    &::before {
+      position: absolute;
+      content: '';
+      z-index: 10;
+    }
+    &::after {
+      background-color: var(--theme-primary-default);
+      transform-origin: center;
+      transition-property: transform;
+      transition-timing-function: ease-in-out;
+      transition-duration: 0.1s;
+      transition-delay: 0s;
+    }
+    &.hovered::after,
+    &:hover::after {
+      transition-duration: 0.15s;
+      transition-delay: 0.25s;
+    }
+    &.horizontal {
+      width: var(--separator-size, 1px);
+      height: 100%;
+      max-width: var(--separator-size, 1px);
+      cursor: col-resize;
+
+      &::after,
+      &::before {
+        top: 0;
+        left: -2px;
+        width: calc(4px + var(--separator-size, 1px));
+        height: 100%;
+      }
+      &::after {
+        transform: scaleX(0);
+      }
+      &.hovered::after,
+      &:hover::after {
+        transform: scaleX(1);
+      }
+    }
+    &.vertical {
+      width: 100%;
+      height: var(--separator-size, 1px);
+      max-height: var(--separator-size, 1px);
+      cursor: row-resize;
+
+      &::after,
+      &::before {
+        top: -2px;
+        left: 0;
+        width: 100%;
+        height: calc(4px + var(--separator-size, 1px));
+      }
+      &::after {
+        transform: scaleY(0);
+      }
+      &.hovered::after,
+      &:hover::after {
+        transform: scaleY(1);
+      }
+    }
+  }
+</style>
diff --git a/packages/ui/src/index.ts b/packages/ui/src/index.ts
index efe37787f1..4a0c5f59bd 100644
--- a/packages/ui/src/index.ts
+++ b/packages/ui/src/index.ts
@@ -35,7 +35,11 @@ export type {
   ButtonSize,
   IconSize,
   TabItem,
-  DeviceOptions
+  DeviceOptions,
+  TSeparatedItem,
+  SeparatedItem,
+  DefSeparators,
+  SeparatedElement
 } from './types'
 
 export { themeStore } from '@hcengineering/theme'
@@ -114,6 +118,7 @@ export { default as TabList } from './components/TabList.svelte'
 export { default as Chevron } from './components/Chevron.svelte'
 export { default as Timeline } from './components/Timeline.svelte'
 export { default as TimeShiftPresenter } from './components/TimeShiftPresenter.svelte'
+export { default as Separator } from './components/Separator.svelte'
 
 export { default as IconAdd } from './components/icons/Add.svelte'
 export { default as IconCircleAdd } from './components/icons/CircleAdd.svelte'
diff --git a/packages/ui/src/resize.ts b/packages/ui/src/resize.ts
index 491e9b2a4b..76ff5ca5c9 100644
--- a/packages/ui/src/resize.ts
+++ b/packages/ui/src/resize.ts
@@ -11,6 +11,7 @@
 // See the License for the specific language governing permissions and
 
 import { DelayedCaller } from './utils'
+import type { SeparatedItem, DefSeparators } from './types'
 
 // limitations under the License.
 let observer: ResizeObserver
@@ -56,3 +57,69 @@ export function resizeObserver (element: Element, onResize: (element: Element) =
     }
   }
 }
+
+/**
+ * @public
+ */
+export const separatorsKeyId = 'separators'
+
+export const nullSeparatedItem: SeparatedItem = {
+  size: 'auto',
+  minSize: 20,
+  maxSize: 'auto',
+  float: undefined
+}
+
+const compareSeparators = (a: SeparatedItem[], b: SeparatedItem[]): boolean => {
+  if (a.length !== b.length) return false
+  return a.every(
+    (sep, index) => sep.minSize === b[index].minSize && sep.maxSize === b[index].maxSize && sep.float === b[index].float
+  )
+}
+
+const generateSeparatorsId = (name: string): string => {
+  return separatorsKeyId + '_' + name
+}
+
+export function defineSeparators (name: string, items: DefSeparators): void {
+  const id = generateSeparatorsId(name)
+  const income = items.map((it) => (it === null ? nullSeparatedItem : it))
+  const saved = localStorage.getItem(id)
+  let needAdd = false
+  if (saved !== null) {
+    const loaded: SeparatedItem[] = JSON.parse(saved)
+    if (!compareSeparators(loaded, income)) {
+      localStorage.removeItem(id)
+      needAdd = true
+    }
+  } else needAdd = true
+  if (needAdd) localStorage.setItem(id, JSON.stringify(income))
+}
+
+export function getSeparators (name: string): SeparatedItem[] | null {
+  const id = generateSeparatorsId(name)
+  const saved = localStorage.getItem(id)
+  return saved !== null ? JSON.parse(saved) : null
+}
+
+export function saveSeparator (name: string, separators: SeparatedItem[]): void {
+  const id = generateSeparatorsId(name)
+  localStorage.setItem(id, JSON.stringify(separators))
+}
+
+export const panelSeparators: DefSeparators = [
+  { minSize: 30, size: 'auto', maxSize: 'auto' },
+  { minSize: 17, size: 25, maxSize: 50, float: 'aside' }
+]
+
+export const workbenchSeparators: DefSeparators = [
+  { minSize: 12, size: 17.5, maxSize: 22, float: 'navigator' },
+  null,
+  { minSize: 20, size: 30, maxSize: 50, float: 'aside' }
+]
+
+export const timeSeparators: DefSeparators = [
+  { minSize: 10, size: 17.5, maxSize: 22, float: 'navigator' },
+  { minSize: 25, size: 35, maxSize: 45 },
+  null
+]
diff --git a/packages/ui/src/types.ts b/packages/ui/src/types.ts
index aff86afe52..bfc8184a20 100644
--- a/packages/ui/src/types.ts
+++ b/packages/ui/src/types.ts
@@ -428,3 +428,23 @@ export const HOUR = MINUTE * 60
 export const DAY = HOUR * 24
 export const MONTH = DAY * 30
 export const YEAR = MONTH * 12
+
+export type TSeparatedItem = number | 'auto'
+export interface SeparatedItem {
+  size: TSeparatedItem
+  minSize: TSeparatedItem
+  maxSize: TSeparatedItem
+  float?: string | undefined
+}
+export type DefSeparators = Array<SeparatedItem | null>
+export interface SeparatedElement {
+  id: number
+  element: Element
+  styles: Map<string, string> | null
+  minSize: number
+  size: number
+  maxSize: number
+  begin: boolean
+  resize: boolean
+  float?: string | undefined
+}
diff --git a/plugins/hr-resources/src/components/Schedule.svelte b/plugins/hr-resources/src/components/Schedule.svelte
index 810772e476..59e81948bd 100644
--- a/plugins/hr-resources/src/components/Schedule.svelte
+++ b/plugins/hr-resources/src/components/Schedule.svelte
@@ -21,7 +21,17 @@
   import { Department, Staff } from '@hcengineering/hr'
   import { createQuery } from '@hcengineering/presentation'
   import type { TabItem } from '@hcengineering/ui'
-  import { Button, IconBack, IconForward, Label, SearchEdit, TabList } from '@hcengineering/ui'
+  import {
+    Button,
+    IconBack,
+    IconForward,
+    Label,
+    SearchEdit,
+    TabList,
+    workbenchSeparators,
+    defineSeparators,
+    Separator
+  } from '@hcengineering/ui'
   import view from '@hcengineering/view'
 
   import hr from '../plugin'
@@ -110,6 +120,8 @@
     { id: 'chart', icon: view.icon.Views },
     { id: 'stats', icon: view.icon.Table }
   ]
+
+  defineSeparators('workbench', workbenchSeparators)
 </script>
 
 <div class="flex h-full">
@@ -120,6 +132,7 @@
       departmentById={departments}
       on:selected={(e) => departmentSelected(e.detail)}
     />
+    <Separator name={'workbench'} index={0} />
   {/if}
 
   <div class="antiPanel-component filled">
diff --git a/plugins/notification-resources/src/components/Inbox.svelte b/plugins/notification-resources/src/components/Inbox.svelte
index 3e13580b06..5cd7ada0ec 100644
--- a/plugins/notification-resources/src/components/Inbox.svelte
+++ b/plugins/notification-resources/src/components/Inbox.svelte
@@ -27,7 +27,9 @@
     eventToHTMLElement,
     getLocation,
     navigate,
-    showPopup
+    showPopup,
+    defineSeparators,
+    Separator
   } from '@hcengineering/ui'
   import view from '@hcengineering/view'
   import contact from '@hcengineering/contact'
@@ -132,6 +134,7 @@
       }
     )
   }
+  defineSeparators('inbox', [{ minSize: 20, maxSize: 40, size: 30 }, null])
 </script>
 
 <div class="flex-row-top h-full">
@@ -158,6 +161,7 @@
         </svelte:fragment>
       </Tabs>
     </div>
+    <Separator name={'inbox'} index={0} />
   {/if}
   <div class="antiPanel-component filled w-full">
     {#if selectedEmployee !== undefined && component === undefined}
diff --git a/plugins/workbench-resources/src/components/Workbench.svelte b/plugins/workbench-resources/src/components/Workbench.svelte
index 043d81ed44..0e5e6e9031 100644
--- a/plugins/workbench-resources/src/components/Workbench.svelte
+++ b/plugins/workbench-resources/src/components/Workbench.svelte
@@ -51,7 +51,10 @@
     resizeObserver,
     resolvedLocationStore,
     setResolvedLocation,
-    showPopup
+    showPopup,
+    Separator,
+    defineSeparators,
+    workbenchSeparators
   } from '@hcengineering/ui'
   import view from '@hcengineering/view'
   import {
@@ -472,40 +475,8 @@
 
   let aside: HTMLElement
   let cover: HTMLElement
-  let isResizing: boolean = false
   let asideWidth: number
   let componentWidth: number
-  let dX: number
-  let oldX: number
-
-  const resizing = (event: MouseEvent): void => {
-    if (isResizing && aside) {
-      const X = event.clientX - dX
-      const newWidth = asideWidth + oldX - X
-      if (newWidth > 320 && componentWidth - (oldX - X) > 320) {
-        aside.style.width = aside.style.maxWidth = aside.style.minWidth = newWidth + 'px'
-        oldX = X
-      }
-    }
-  }
-  const endResize = (event: MouseEvent): void => {
-    const el: HTMLElement = event.currentTarget as HTMLElement
-    if (el && isResizing) document.removeEventListener('mousemove', resizing)
-    document.removeEventListener('mouseup', endResize)
-    cover.style.display = 'none'
-    isResizing = false
-  }
-  const startResize = (event: MouseEvent): void => {
-    const el: HTMLElement = event.currentTarget as HTMLElement
-    if (el && !isResizing) {
-      oldX = el.getBoundingClientRect().y
-      dX = event.clientX - oldX
-      document.addEventListener('mouseup', endResize)
-      document.addEventListener('mousemove', resizing)
-      cover.style.display = 'block'
-      isResizing = true
-    }
-  }
 
   let navFloat: boolean = !($deviceInfo.docWidth < 1024)
   $: if ($deviceInfo.docWidth <= 1024 && !navFloat) {
@@ -600,6 +571,8 @@
 
   let inboxPopup: PopupResult | undefined = undefined
   let lastLoc: Location | undefined = undefined
+
+  defineSeparators('workbench', workbenchSeparators)
 </script>
 
 {#if employee?.active === true || accountId === core.account.System}
@@ -751,6 +724,7 @@
             {/if}
           </NavFooter>
         </div>
+        <Separator name={'workbench'} index={0} />
       {/if}
       <div
         class="antiPanel-component antiComponent"
@@ -782,7 +756,7 @@
       {#if asideId && currentSpace}
         {@const asideComponent = navigatorModel?.aside ?? currentApplication?.aside}
         {#if asideComponent !== undefined}
-          <div class="splitter" class:hovered={isResizing} on:mousedown={startResize} />
+          <Separator name={'workbench'} index={1} />
           <div
             class="antiPanel-component antiComponent aside"
             use:resizeObserver={(element) => {