diff --git a/packages/frontend/core/src/bootstrap/setup.ts b/packages/frontend/core/src/bootstrap/setup.ts
index 59dbfe7ebaad6..9e5c308680ef8 100644
--- a/packages/frontend/core/src/bootstrap/setup.ts
+++ b/packages/frontend/core/src/bootstrap/setup.ts
@@ -1,6 +1,7 @@
 import './register-blocksuite-components';
 import './edgeless-template';
 
+import { apis, events } from '@affine/electron-api';
 import { setupGlobal } from '@affine/env/global';
 import * as Sentry from '@sentry/react';
 import { useEffect } from 'react';
@@ -51,10 +52,16 @@ export function setup() {
 
   // load persistent config for electron
   // TODO: should be sync, but it's not necessary for now
-  environment.isDesktop &&
+  if (environment.isDesktop) {
     appConfigProxy
       .getSync()
       .catch(() => console.error('failed to load app config'));
+    const handleMaximized = (maximized: boolean | undefined) => {
+      document.documentElement.dataset.maximized = String(maximized);
+    };
+    apis?.ui.isMaximized().then(handleMaximized).catch(console.error);
+    events?.ui.onMaximized(handleMaximized);
+  }
 
   performanceSetupLogger.info('done');
 }
diff --git a/packages/frontend/electron-api/src/index.ts b/packages/frontend/electron-api/src/index.ts
index 2cccdddc6a07b..ade64fcfca145 100644
--- a/packages/frontend/electron-api/src/index.ts
+++ b/packages/frontend/electron-api/src/index.ts
@@ -21,7 +21,11 @@ type ClientHandler = {
       arg0: any,
       ...rest: infer A
     ) => any
-      ? (...args: A) => Promise<ReturnType<MainHandlers[namespace][method]>>
+      ? (
+          ...args: A
+        ) => ReturnType<MainHandlers[namespace][method]> extends Promise<any>
+          ? ReturnType<MainHandlers[namespace][method]>
+          : Promise<ReturnType<MainHandlers[namespace][method]>>
       : never;
   };
 } & HelperHandlers;
diff --git a/packages/frontend/electron/src/main/main-window.ts b/packages/frontend/electron/src/main/main-window.ts
index f8505d2a9af5a..f66870f4f4a89 100644
--- a/packages/frontend/electron/src/main/main-window.ts
+++ b/packages/frontend/electron/src/main/main-window.ts
@@ -93,6 +93,10 @@ async function createWindow(additionalArguments: string[]) {
     );
 
     logger.info('main window is ready to show');
+
+    if (browserWindow.isMaximized() || browserWindow.isFullScreen()) {
+      uiSubjects.onMaximized.next(true);
+    }
   });
 
   browserWindow.on('close', e => {
diff --git a/packages/frontend/electron/src/main/ui/handlers.ts b/packages/frontend/electron/src/main/ui/handlers.ts
index b43e40b29a9e8..5a30c2f761446 100644
--- a/packages/frontend/electron/src/main/ui/handlers.ts
+++ b/packages/frontend/electron/src/main/ui/handlers.ts
@@ -12,6 +12,10 @@ import { getChallengeResponse } from './challenge';
 import { getGoogleOauthCode } from './google-auth';
 
 export const uiHandlers = {
+  isMaximized: async () => {
+    const window = await getMainWindow();
+    return window?.isMaximized();
+  },
   handleThemeChange: async (_, theme: (typeof nativeTheme)['themeSource']) => {
     nativeTheme.themeSource = theme;
   },