diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index a3267ab..5a53fd5 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "hoa-ledgeriq-frontend",
-  "version": "2026.3.11",
+  "version": "2026.3.17",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "hoa-ledgeriq-frontend",
-      "version": "2026.3.11",
+      "version": "2026.3.17",
       "dependencies": {
         "@mantine/core": "^7.15.3",
         "@mantine/dates": "^7.15.3",
diff --git a/frontend/src/components/layout/Sidebar.tsx b/frontend/src/components/layout/Sidebar.tsx
index e409541..9085993 100644
--- a/frontend/src/components/layout/Sidebar.tsx
+++ b/frontend/src/components/layout/Sidebar.tsx
@@ -17,11 +17,9 @@ import {
   IconChartAreaLine,
   IconClipboardCheck,
   IconSparkles,
-  IconHeartRateMonitor,
   IconCalculator,
   IconGitCompare,
   IconScale,
-  IconSettings,
 } from '@tabler/icons-react';
 import { useAuthStore } from '../../stores/authStore';
 
@@ -47,14 +45,6 @@ const navSections = [
       { label: 'Assessment Groups', icon: IconCategory, path: '/assessment-groups', tourId: 'nav-assessment-groups' },
     ],
   },
-  {
-    label: 'Transactions',
-    items: [
-      { label: 'Transactions', icon: IconReceipt, path: '/transactions', tourId: 'nav-transactions' },
-      { label: 'Invoices', icon: IconFileInvoice, path: '/invoices' },
-      { label: 'Payments', icon: IconCash, path: '/payments' },
-    ],
-  },
   {
     label: 'Board Planning',
     items: [
@@ -68,12 +58,8 @@ const navSections = [
       {
         label: 'Assessment Scenarios', icon: IconCalculator, path: '/board-planning/assessments',
       },
-      {
-        label: 'Investment Planning', icon: IconSparkles, path: '/investment-planning', tourId: 'nav-investment-planning',
-        children: [
-          { label: 'Investment Scenarios', path: '/board-planning/investments' },
-        ],
-      },
+      { label: 'Investment Planning', icon: IconSparkles, path: '/investment-planning', tourId: 'nav-investment-planning' },
+      { label: 'Investment Scenarios', icon: IconScale, path: '/board-planning/investments' },
       { label: 'Compare Scenarios', icon: IconGitCompare, path: '/board-planning/compare' },
     ],
   },
@@ -83,6 +69,14 @@ const navSections = [
       { label: 'Vendors', icon: IconUsers, path: '/vendors' },
     ],
   },
+  {
+    label: 'Transactions',
+    items: [
+      { label: 'Transactions', icon: IconReceipt, path: '/transactions', tourId: 'nav-transactions' },
+      { label: 'Invoices', icon: IconFileInvoice, path: '/invoices' },
+      { label: 'Payments', icon: IconCash, path: '/payments' },
+    ],
+  },
   {
     label: 'Reports',
     items: [
@@ -103,12 +97,6 @@ const navSections = [
       },
     ],
   },
-  {
-    label: 'Account',
-    items: [
-      { label: 'Settings', icon: IconSettings, path: '/settings' },
-    ],
-  },
 ];
 
 interface SidebarProps {
diff --git a/frontend/src/main.tsx b/frontend/src/main.tsx
index 609a2d6..719cfbc 100644
--- a/frontend/src/main.tsx
+++ b/frontend/src/main.tsx
@@ -9,7 +9,7 @@ import '@mantine/core/styles.css';
 import '@mantine/dates/styles.css';
 import '@mantine/notifications/styles.css';
 import { App } from './App';
-import { theme } from './theme/theme';
+import { defaultTheme, compactTheme } from './theme/theme';
 import { usePreferencesStore } from './stores/preferencesStore';
 
 const queryClient = new QueryClient({
@@ -24,9 +24,11 @@ const queryClient = new QueryClient({
 
 function Root() {
   const colorScheme = usePreferencesStore((s) => s.colorScheme);
+  const compactView = usePreferencesStore((s) => s.compactView);
+  const activeTheme = compactView ? compactTheme : defaultTheme;
 
   return (
-    <MantineProvider theme={theme} forceColorScheme={colorScheme}>
+    <MantineProvider theme={activeTheme} forceColorScheme={colorScheme}>
       <Notifications position="top-right" />
       <ModalsProvider>
         <QueryClientProvider client={queryClient}>
diff --git a/frontend/src/pages/preferences/UserPreferencesPage.tsx b/frontend/src/pages/preferences/UserPreferencesPage.tsx
index 5633209..89deb9f 100644
--- a/frontend/src/pages/preferences/UserPreferencesPage.tsx
+++ b/frontend/src/pages/preferences/UserPreferencesPage.tsx
@@ -10,7 +10,7 @@ import { usePreferencesStore } from '../../stores/preferencesStore';
 
 export function UserPreferencesPage() {
   const { user, currentOrg } = useAuthStore();
-  const { colorScheme, toggleColorScheme } = usePreferencesStore();
+  const { colorScheme, toggleColorScheme, compactView, toggleCompactView } = usePreferencesStore();
 
   return (
     <Stack>
@@ -78,7 +78,7 @@ export function UserPreferencesPage() {
                 <Text size="sm">Compact View</Text>
                 <Text size="xs" c="dimmed">Reduce spacing in tables and lists</Text>
               </div>
-              <Switch disabled />
+              <Switch checked={compactView} onChange={toggleCompactView} />
             </Group>
             <Divider />
             <Text size="xs" c="dimmed" ta="center">More display preferences coming in a future release</Text>
diff --git a/frontend/src/pages/settings/SettingsPage.tsx b/frontend/src/pages/settings/SettingsPage.tsx
index cbb813c..0992716 100644
--- a/frontend/src/pages/settings/SettingsPage.tsx
+++ b/frontend/src/pages/settings/SettingsPage.tsx
@@ -1,7 +1,7 @@
 import { useState } from 'react';
 import {
   Title, Text, Card, Stack, Group, SimpleGrid, Badge, ThemeIcon, Divider,
-  Tabs, Button,
+  Tabs, Button, Switch,
 } from '@mantine/core';
 import {
   IconBuilding, IconUser, IconSettings, IconShieldLock,
@@ -9,6 +9,7 @@ import {
 } from '@tabler/icons-react';
 import { notifications } from '@mantine/notifications';
 import { useAuthStore } from '../../stores/authStore';
+import { usePreferencesStore } from '../../stores/preferencesStore';
 import { MfaSettings } from './MfaSettings';
 import { PasskeySettings } from './PasskeySettings';
 import { LinkedAccounts } from './LinkedAccounts';
@@ -16,6 +17,7 @@ import api from '../../services/api';
 
 export function SettingsPage() {
   const { user, currentOrg } = useAuthStore();
+  const { compactView, toggleCompactView } = usePreferencesStore();
   const [loggingOutAll, setLoggingOutAll] = useState(false);
 
   const handleLogoutEverywhere = async () => {
@@ -112,6 +114,14 @@ export function SettingsPage() {
               <Text size="sm" c="dimmed">API</Text>
               <Text size="sm" ff="monospace" c="dimmed">/api/docs</Text>
             </Group>
+            <Divider />
+            <Group justify="space-between">
+              <div>
+                <Text size="sm">Compact View</Text>
+                <Text size="xs" c="dimmed">Reduce spacing in tables and lists</Text>
+              </div>
+              <Switch checked={compactView} onChange={toggleCompactView} />
+            </Group>
           </Stack>
         </Card>
 
diff --git a/frontend/src/stores/preferencesStore.ts b/frontend/src/stores/preferencesStore.ts
index f2160fc..992d9ce 100644
--- a/frontend/src/stores/preferencesStore.ts
+++ b/frontend/src/stores/preferencesStore.ts
@@ -5,19 +5,26 @@ type ColorScheme = 'light' | 'dark';
 
 interface PreferencesState {
   colorScheme: ColorScheme;
+  compactView: boolean;
   toggleColorScheme: () => void;
   setColorScheme: (scheme: ColorScheme) => void;
+  toggleCompactView: () => void;
+  setCompactView: (compact: boolean) => void;
 }
 
 export const usePreferencesStore = create<PreferencesState>()(
   persist(
     (set) => ({
       colorScheme: 'light',
+      compactView: false,
       toggleColorScheme: () =>
         set((state) => ({
           colorScheme: state.colorScheme === 'light' ? 'dark' : 'light',
         })),
       setColorScheme: (scheme) => set({ colorScheme: scheme }),
+      toggleCompactView: () =>
+        set((state) => ({ compactView: !state.compactView })),
+      setCompactView: (compact) => set({ compactView: compact }),
     }),
     {
       name: 'ledgeriq-preferences',
diff --git a/frontend/src/theme/theme.ts b/frontend/src/theme/theme.ts
index 6a0c729..2e9d775 100644
--- a/frontend/src/theme/theme.ts
+++ b/frontend/src/theme/theme.ts
@@ -1,10 +1,57 @@
 import { createTheme } from '@mantine/core';
 
-export const theme = createTheme({
+const baseFontFamily = '-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, sans-serif';
+
+export const defaultTheme = createTheme({
   primaryColor: 'blue',
-  fontFamily: '-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, sans-serif',
+  fontFamily: baseFontFamily,
   headings: {
-    fontFamily: '-apple-system, BlinkMacSystemFont, Segoe UI, Roboto, sans-serif',
+    fontFamily: baseFontFamily,
   },
   defaultRadius: 'md',
 });
+
+export const compactTheme = createTheme({
+  primaryColor: 'blue',
+  fontFamily: baseFontFamily,
+  headings: {
+    fontFamily: baseFontFamily,
+  },
+  defaultRadius: 'md',
+  spacing: {
+    xs: '4px',
+    sm: '6px',
+    md: '10px',
+    lg: '12px',
+    xl: '16px',
+  },
+  fontSizes: {
+    xs: '11px',
+    sm: '12px',
+    md: '13px',
+    lg: '15px',
+    xl: '18px',
+  },
+  components: {
+    Table: {
+      defaultProps: {
+        verticalSpacing: 'xs',
+        horizontalSpacing: 'xs',
+        fz: 'sm',
+      },
+    },
+    Card: {
+      defaultProps: {
+        padding: 'sm',
+      },
+    },
+    AppShell: {
+      defaultProps: {
+        padding: 'xs',
+      },
+    },
+  },
+});
+
+/** @deprecated Use `defaultTheme` or `compactTheme` instead */
+export const theme = defaultTheme;