diff --git a/flutter/lib/desktop/widgets/remote_toolbar.dart b/flutter/lib/desktop/widgets/remote_toolbar.dart
index 2d20d5931..d0fbc4673 100644
--- a/flutter/lib/desktop/widgets/remote_toolbar.dart
+++ b/flutter/lib/desktop/widgets/remote_toolbar.dart
@@ -436,6 +436,7 @@ class _RemoteToolbarState extends State<RemoteToolbar> {
             shadowColor: MyTheme.color(context).shadow,
             borderRadius: borderRadius,
             child: _DraggableShowHide(
+              id: widget.id,
               sessionId: widget.ffi.sessionId,
               dragging: _dragging,
               fractionX: _fractionX,
@@ -2218,6 +2219,7 @@ class RdoMenuButton<T> extends StatelessWidget {
 }
 
 class _DraggableShowHide extends StatefulWidget {
+  final String id;
   final SessionID sessionId;
   final RxDouble fractionX;
   final RxBool dragging;
@@ -2229,6 +2231,7 @@ class _DraggableShowHide extends StatefulWidget {
 
   const _DraggableShowHide({
     Key? key,
+    required this.id,
     required this.sessionId,
     required this.fractionX,
     required this.dragging,
@@ -2364,6 +2367,24 @@ class _DraggableShowHideState extends State<_DraggableShowHide> {
                 ),
               ))),
         ),
+        if (isWebDesktop)
+          Obx(() {
+            if (show.isTrue) {
+              return Offstage();
+            } else {
+              return TextButton(
+                onPressed: () => closeConnection(id: widget.id),
+                child: Tooltip(
+                  message: translate('Close'),
+                  child: Icon(
+                    Icons.close,
+                    size: iconSize,
+                    color: _ToolbarTheme.redColor,
+                  ),
+                ),
+              );
+            }
+          })
       ],
     );
     return TextButtonTheme(
diff --git a/flutter/lib/models/native_model.dart b/flutter/lib/models/native_model.dart
index b99cf2e7f..c8d5085e8 100644
--- a/flutter/lib/models/native_model.dart
+++ b/flutter/lib/models/native_model.dart
@@ -48,6 +48,12 @@ class PlatformFFI {
 
   static get isMain => instance._appType == kAppTypeMain;
 
+  static String getByName(String name, [String arg = '']) {
+    return '';
+  }
+
+  static void setByName(String name, [String value = '']) {}
+
   static Future<String> getVersion() async {
     PackageInfo packageInfo = await PackageInfo.fromPlatform();
     return packageInfo.version;
@@ -276,4 +282,6 @@ class PlatformFFI {
   void syncAndroidServiceAppDirConfigPath() {
     invokeMethod(AndroidChannel.kSyncAppDirConfigPath, _dir);
   }
+
+  void setFullscreenCallback(void Function(bool) fun) {}
 }
diff --git a/flutter/lib/models/state_model.dart b/flutter/lib/models/state_model.dart
index a1b5fc736..62f92db12 100644
--- a/flutter/lib/models/state_model.dart
+++ b/flutter/lib/models/state_model.dart
@@ -2,6 +2,7 @@ import 'package:desktop_multi_window/desktop_multi_window.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_hbb/common.dart';
 import 'package:get/get.dart';
+import 'native_model.dart' if (dart.library.html) 'web_model.dart';
 
 import '../consts.dart';
 import './platform_model.dart';
@@ -73,27 +74,47 @@ class StateGlobal {
     if (_fullscreen.value != v) {
       _fullscreen.value = v;
       _showTabBar.value = !_fullscreen.value;
-      refreshResizeEdgeSize();
-      print(
-          "fullscreen: $fullscreen, resizeEdgeSize: ${_resizeEdgeSize.value}");
-      _windowBorderWidth.value = fullscreen.isTrue ? 0 : kWindowBorderWidth;
-      if (procWnd) {
-        final wc = WindowController.fromWindowId(windowId);
-        wc.setFullscreen(_fullscreen.isTrue).then((_) {
-          // https://github.com/leanflutter/window_manager/issues/131#issuecomment-1111587982
-          if (isWindows && !v) {
-            Future.delayed(Duration.zero, () async {
-              final frame = await wc.getFrame();
-              final newRect = Rect.fromLTWH(
-                  frame.left, frame.top, frame.width + 1, frame.height + 1);
-              await wc.setFrame(newRect);
-            });
-          }
-        });
+      if (isWebDesktop) {
+        procFullscreenWeb();
+      } else {
+        procFullscreenNative(procWnd);
       }
     }
   }
 
+  procFullscreenWeb() {
+    final isFullscreen = PlatformFFI.getByName('fullscreen') == 'Y';
+    String fullscreenValue = '';
+    if (isFullscreen && _fullscreen.isFalse) {
+      fullscreenValue = 'N';
+    } else if (!isFullscreen && fullscreen.isTrue) {
+      fullscreenValue = 'Y';
+    }
+    if (fullscreenValue.isNotEmpty) {
+      PlatformFFI.setByName('fullscreen', fullscreenValue);
+    }
+  }
+
+  procFullscreenNative(bool procWnd) {
+    refreshResizeEdgeSize();
+    print("fullscreen: $fullscreen, resizeEdgeSize: ${_resizeEdgeSize.value}");
+    _windowBorderWidth.value = fullscreen.isTrue ? 0 : kWindowBorderWidth;
+    if (procWnd) {
+      final wc = WindowController.fromWindowId(windowId);
+      wc.setFullscreen(_fullscreen.isTrue).then((_) {
+        // https://github.com/leanflutter/window_manager/issues/131#issuecomment-1111587982
+        if (isWindows && _fullscreen.isFalse) {
+          Future.delayed(Duration.zero, () async {
+            final frame = await wc.getFrame();
+            final newRect = Rect.fromLTWH(
+                frame.left, frame.top, frame.width + 1, frame.height + 1);
+            await wc.setFrame(newRect);
+          });
+        }
+      });
+    }
+  }
+
   refreshResizeEdgeSize() => _resizeEdgeSize.value = fullscreen.isTrue
       ? kFullScreenEdgeSize
       : isMaximized.isTrue
@@ -112,7 +133,13 @@ class StateGlobal {
     _inputSource = bind.mainGetInputSource();
   }
 
-  StateGlobal._();
+  StateGlobal._() {
+    if (isWebDesktop) {
+      platformFFI.setFullscreenCallback((v) {
+        _fullscreen.value = v;
+      });
+    }
+  }
 
   static final StateGlobal instance = StateGlobal._();
 }
diff --git a/flutter/lib/models/web_model.dart b/flutter/lib/models/web_model.dart
index ff0d1b806..a5740af61 100644
--- a/flutter/lib/models/web_model.dart
+++ b/flutter/lib/models/web_model.dart
@@ -166,4 +166,10 @@ class PlatformFFI {
 
   // just for compilation
   void syncAndroidServiceAppDirConfigPath() {}
+
+  void setFullscreenCallback(void Function(bool) fun) {
+    context["onFullscreenChanged"] = (bool v) {
+      fun(v);
+    };
+  }
 }