diff --git a/.github/copilot-instructions.md b/.github/copilot-instructions.md
deleted file mode 100644
index 451ffb2bd..000000000
--- a/.github/copilot-instructions.md
+++ /dev/null
@@ -1,53 +0,0 @@
-# Navidrome Code Guidelines
-
-This is a music streaming server written in Go with a React frontend. The application manages music libraries, provides streaming capabilities, and offers various features like artist information, artwork handling, and external service integrations.
-
-## Code Standards
-
-### Backend (Go)
-- Follow standard Go conventions and idioms
-- Use context propagation for cancellation signals
-- Write unit tests for new functionality using Ginkgo/Gomega
-- Use mutex appropriately for concurrent operations
-- Implement interfaces for dependencies to facilitate testing
-
-### Frontend (React)
-- Use functional components with hooks
-- Follow React best practices for state management
-- Implement PropTypes for component properties
-- Prefer using React-Admin and Material-UI components
-- Icons should be imported from `react-icons` only
-- Follow existing patterns for API interaction
-
-## Repository Structure
-- `core/`: Server-side business logic (artwork handling, playback, etc.)
-- `ui/`: React frontend components
-- `model/`: Data models and repository interfaces
-- `server/`: API endpoints and server implementation
-- `utils/`: Shared utility functions
-- `persistence/`: Database access layer
-- `scanner/`: Music library scanning functionality
-
-## Key Guidelines
-1. Maintain cache management patterns for performance
-2. Follow the existing concurrency patterns (mutex, atomic)
-3. Use the testing framework appropriately (Ginkgo/Gomega for Go)
-4. Keep UI components focused and reusable
-5. Document configuration options in code
-6. Consider performance implications when working with music libraries
-7. Follow existing error handling patterns
-8. Ensure compatibility with external services (LastFM, Spotify, Deezer)
-
-## Development Workflow
-- Test changes thoroughly, especially around concurrent operations
-- Validate both backend and frontend interactions
-- Consider how changes will affect user experience and performance
-- Test with different music library sizes and configurations
-- Before committing, ALWAYS run `make format lint test`, and make sure there are no issues
-
-## Important commands
-- `make build`: Build the application
-- `make test`: Run Go tests
-- To run tests for a specific package, use `make test PKG=./pkgname/...`
-- `make lintall`: Run linters
-- `make format`: Format code
diff --git a/ui/src/App.jsx b/ui/src/App.jsx
index 1c613f133..dc4fe9b53 100644
--- a/ui/src/App.jsx
+++ b/ui/src/App.jsx
@@ -19,6 +19,7 @@ import library from './library'
 import { Player } from './audioplayer'
 import customRoutes from './routes'
 import {
+  libraryReducer,
   themeReducer,
   addToPlaylistDialogReducer,
   expandInfoDialogReducer,
@@ -57,6 +58,7 @@ const adminStore = createAdminStore({
   dataProvider,
   history,
   customReducers: {
+    library: libraryReducer,
     player: playerReducer,
     albumView: albumViewReducer,
     theme: themeReducer,
diff --git a/ui/src/actions/index.js b/ui/src/actions/index.js
index a319f7a69..9f35f86a9 100644
--- a/ui/src/actions/index.js
+++ b/ui/src/actions/index.js
@@ -1,3 +1,4 @@
+export * from './library'
 export * from './player'
 export * from './themes'
 export * from './albumView'
diff --git a/ui/src/actions/library.js b/ui/src/actions/library.js
new file mode 100644
index 000000000..4653ec739
--- /dev/null
+++ b/ui/src/actions/library.js
@@ -0,0 +1,12 @@
+export const SET_SELECTED_LIBRARIES = 'SET_SELECTED_LIBRARIES'
+export const SET_USER_LIBRARIES = 'SET_USER_LIBRARIES'
+
+export const setSelectedLibraries = (libraryIds) => ({
+  type: SET_SELECTED_LIBRARIES,
+  data: libraryIds,
+})
+
+export const setUserLibraries = (libraries) => ({
+  type: SET_USER_LIBRARIES,
+  data: libraries,
+})
diff --git a/ui/src/common/LibrarySelector.jsx b/ui/src/common/LibrarySelector.jsx
new file mode 100644
index 000000000..16baaa949
--- /dev/null
+++ b/ui/src/common/LibrarySelector.jsx
@@ -0,0 +1,208 @@
+import React, { useState, useEffect } from 'react'
+import { useDispatch, useSelector } from 'react-redux'
+import { useDataProvider, useTranslate } from 'react-admin'
+import {
+  Box,
+  Chip,
+  ClickAwayListener,
+  FormControl,
+  FormGroup,
+  FormControlLabel,
+  Checkbox,
+  Typography,
+  Paper,
+  Popper,
+  makeStyles,
+} from '@material-ui/core'
+import { ExpandMore, ExpandLess, LibraryMusic } from '@material-ui/icons'
+import { setSelectedLibraries, setUserLibraries } from '../actions'
+
+const useStyles = makeStyles((theme) => ({
+  root: {
+    marginTop: theme.spacing(3),
+    marginBottom: theme.spacing(3),
+    paddingLeft: theme.spacing(2),
+    paddingRight: theme.spacing(2),
+    display: 'flex',
+    justifyContent: 'center',
+  },
+  chip: {
+    borderRadius: theme.spacing(1), // Less rounded corners to better match search input
+    height: theme.spacing(4.8), // Slightly reduce height to better match search input
+    fontSize: '1rem', // Match sidebar menu items font size
+    fontWeight: 'normal', // Match sidebar menu items font weight
+    minWidth: '210px', // Ensure minimum width
+    justifyContent: 'flex-start',
+    paddingLeft: theme.spacing(1),
+    paddingRight: theme.spacing(1),
+    marginTop: theme.spacing(0.1),
+    '& .MuiChip-label': {
+      paddingLeft: theme.spacing(2),
+      paddingRight: theme.spacing(1),
+    },
+    '& .MuiChip-icon': {
+      fontSize: '1.2rem',
+      marginLeft: theme.spacing(0.5),
+    },
+  },
+  popper: {
+    zIndex: 1300,
+  },
+  paper: {
+    padding: theme.spacing(2),
+    marginTop: theme.spacing(1),
+    minWidth: 300,
+    maxWidth: 400,
+  },
+  headerContainer: {
+    display: 'flex',
+    alignItems: 'center',
+    marginBottom: 0,
+  },
+  masterCheckbox: {
+    padding: '7px', // Match the default Material-UI checkbox padding
+    marginLeft: '-9px', // Negative margin to align with FormControlLabel checkboxes
+    marginRight: 0,
+  },
+}))
+
+const LibrarySelector = () => {
+  const classes = useStyles()
+  const dispatch = useDispatch()
+  const dataProvider = useDataProvider()
+  const translate = useTranslate()
+  const [anchorEl, setAnchorEl] = useState(null)
+  const [open, setOpen] = useState(false)
+
+  const { userLibraries, selectedLibraries } = useSelector(
+    (state) => state.library,
+  )
+
+  // Load user's libraries when component mounts
+  useEffect(() => {
+    const loadUserLibraries = async () => {
+      // Get userId from localStorage (not from identity which returns username)
+      const userId = localStorage.getItem('userId')
+      if (userId) {
+        try {
+          const { data } = await dataProvider.getOne('user', { id: userId })
+          const libraries = data.libraries || []
+          dispatch(setUserLibraries(libraries))
+        } catch (error) {
+          // eslint-disable-next-line no-console
+          console.warn(
+            'Could not load user libraries (this may be expected for non-admin users):',
+            error,
+          )
+        }
+      }
+    }
+
+    loadUserLibraries()
+  }, [dataProvider, dispatch])
+
+  // Don't render if user has no libraries or only has one library
+  if (!userLibraries.length || userLibraries.length === 1) {
+    return null
+  }
+
+  const handleToggle = (event) => {
+    setAnchorEl(event.currentTarget)
+    setOpen(!open)
+  }
+
+  const handleClose = () => {
+    setOpen(false)
+  }
+
+  const handleLibraryToggle = (libraryId) => {
+    const newSelection = selectedLibraries.includes(libraryId)
+      ? selectedLibraries.filter((id) => id !== libraryId)
+      : [...selectedLibraries, libraryId]
+
+    dispatch(setSelectedLibraries(newSelection))
+  }
+
+  const handleMasterCheckboxChange = () => {
+    if (isAllSelected) {
+      dispatch(setSelectedLibraries([]))
+    } else {
+      const allIds = userLibraries.map((lib) => lib.id)
+      dispatch(setSelectedLibraries(allIds))
+    }
+  }
+
+  const selectedCount = selectedLibraries.length
+  const totalCount = userLibraries.length
+  const isAllSelected = selectedCount === totalCount
+  const isNoneSelected = selectedCount === 0
+  const isIndeterminate = selectedCount > 0 && selectedCount < totalCount
+
+  const displayText = isNoneSelected
+    ? translate('menu.librarySelector.none') + ` (0 of ${totalCount})`
+    : isAllSelected
+      ? translate('menu.librarySelector.allLibraries', { count: totalCount })
+      : translate('menu.librarySelector.multipleLibraries', {
+          selected: selectedCount,
+          total: totalCount,
+        })
+
+  return (
+    <Box className={classes.root}>
+      <Chip
+        icon={<LibraryMusic />}
+        label={displayText}
+        onClick={handleToggle}
+        onDelete={open ? handleToggle : undefined}
+        deleteIcon={open ? <ExpandLess /> : <ExpandMore />}
+        variant="outlined"
+        clickable
+        className={classes.chip}
+      />
+
+      <Popper
+        open={open}
+        anchorEl={anchorEl}
+        placement="bottom-start"
+        className={classes.popper}
+      >
+        <ClickAwayListener onClickAway={handleClose}>
+          <Paper className={classes.paper}>
+            <Box className={classes.headerContainer}>
+              <Checkbox
+                checked={isAllSelected}
+                indeterminate={isIndeterminate}
+                onChange={handleMasterCheckboxChange}
+                size="small"
+                className={classes.masterCheckbox}
+              />
+              <Typography>
+                {translate('menu.librarySelector.selectLibraries')}:
+              </Typography>
+            </Box>
+
+            <FormControl component="fieldset" variant="standard" fullWidth>
+              <FormGroup>
+                {userLibraries.map((library) => (
+                  <FormControlLabel
+                    key={library.id}
+                    control={
+                      <Checkbox
+                        checked={selectedLibraries.includes(library.id)}
+                        onChange={() => handleLibraryToggle(library.id)}
+                        size="small"
+                      />
+                    }
+                    label={library.name}
+                  />
+                ))}
+              </FormGroup>
+            </FormControl>
+          </Paper>
+        </ClickAwayListener>
+      </Popper>
+    </Box>
+  )
+}
+
+export default LibrarySelector
diff --git a/ui/src/common/useLibrarySelection.js b/ui/src/common/useLibrarySelection.js
new file mode 100644
index 000000000..c5d84a61f
--- /dev/null
+++ b/ui/src/common/useLibrarySelection.js
@@ -0,0 +1,44 @@
+import { useSelector } from 'react-redux'
+
+/**
+ * Hook to get the currently selected library IDs
+ * Returns an array of library IDs that should be used for filtering data
+ * If no libraries are selected (empty array), returns all user accessible libraries
+ */
+export const useSelectedLibraries = () => {
+  const { userLibraries, selectedLibraries } = useSelector(
+    (state) => state.library,
+  )
+
+  // If no specific selection, default to all accessible libraries
+  if (selectedLibraries.length === 0 && userLibraries.length > 0) {
+    return userLibraries.map((lib) => lib.id)
+  }
+
+  return selectedLibraries
+}
+
+/**
+ * Hook to get library filter parameters for data provider queries
+ * Returns an object that can be spread into query parameters
+ */
+export const useLibraryFilter = () => {
+  const selectedLibraryIds = useSelectedLibraries()
+
+  // If user has access to only one library or no specific selection, no filter needed
+  if (selectedLibraryIds.length <= 1) {
+    return {}
+  }
+
+  return {
+    libraryIds: selectedLibraryIds,
+  }
+}
+
+/**
+ * Hook to check if a specific library is currently selected
+ */
+export const useIsLibrarySelected = (libraryId) => {
+  const selectedLibraryIds = useSelectedLibraries()
+  return selectedLibraryIds.includes(libraryId)
+}
diff --git a/ui/src/i18n/en.json b/ui/src/i18n/en.json
index 3def7dcc5..9525b878d 100644
--- a/ui/src/i18n/en.json
+++ b/ui/src/i18n/en.json
@@ -517,6 +517,12 @@
   },
   "menu": {
     "library": "Library",
+    "librarySelector": {
+      "allLibraries": "All Libraries (%{count})",
+      "multipleLibraries": "%{selected} of %{total} Libraries",
+      "selectLibraries": "Select Libraries",
+      "none": "None"
+    },
     "settings": "Settings",
     "version": "Version",
     "theme": "Theme",
diff --git a/ui/src/layout/Menu.jsx b/ui/src/layout/Menu.jsx
index bd1e37ee0..45f40b26d 100644
--- a/ui/src/layout/Menu.jsx
+++ b/ui/src/layout/Menu.jsx
@@ -9,6 +9,7 @@ import SubMenu from './SubMenu'
 import { humanize, pluralize } from 'inflection'
 import albumLists from '../album/albumLists'
 import PlaylistsSubMenu from './PlaylistsSubMenu'
+import LibrarySelector from '../common/LibrarySelector'
 import config from '../config'
 
 const useStyles = makeStyles((theme) => ({
@@ -111,6 +112,7 @@ const Menu = ({ dense = false }) => {
         [classes.closed]: !open,
       })}
     >
+      {open && <LibrarySelector />}
       <SubMenu
         handleToggle={() => handleToggle('menuAlbumList')}
         isOpen={state.menuAlbumList}
diff --git a/ui/src/reducers/index.js b/ui/src/reducers/index.js
index b9414c864..3db0b1dff 100644
--- a/ui/src/reducers/index.js
+++ b/ui/src/reducers/index.js
@@ -1,3 +1,4 @@
+export * from './libraryReducer'
 export * from './themeReducer'
 export * from './dialogReducer'
 export * from './playerReducer'
diff --git a/ui/src/reducers/libraryReducer.js b/ui/src/reducers/libraryReducer.js
new file mode 100644
index 000000000..f96f47e12
--- /dev/null
+++ b/ui/src/reducers/libraryReducer.js
@@ -0,0 +1,30 @@
+import { SET_SELECTED_LIBRARIES, SET_USER_LIBRARIES } from '../actions'
+
+const initialState = {
+  userLibraries: [],
+  selectedLibraries: [], // Empty means "all accessible libraries"
+}
+
+export const libraryReducer = (previousState = initialState, payload) => {
+  const { type, data } = payload
+  switch (type) {
+    case SET_USER_LIBRARIES:
+      return {
+        ...previousState,
+        userLibraries: data,
+        // If this is the first time setting user libraries and no selection exists,
+        // default to all libraries
+        selectedLibraries:
+          previousState.selectedLibraries.length === 0
+            ? data.map((lib) => lib.id)
+            : previousState.selectedLibraries,
+      }
+    case SET_SELECTED_LIBRARIES:
+      return {
+        ...previousState,
+        selectedLibraries: data,
+      }
+    default:
+      return previousState
+  }
+}
diff --git a/ui/src/store/createAdminStore.js b/ui/src/store/createAdminStore.js
index e4877eb14..4888e49e4 100644
--- a/ui/src/store/createAdminStore.js
+++ b/ui/src/store/createAdminStore.js
@@ -57,6 +57,7 @@ const createAdminStore = ({
       const state = store.getState()
       saveState({
         theme: state.theme,
+        library: state.library,
         player: (({ queue, volume, savedPlayIndex }) => ({
           queue,
           volume,