You can do it with the window_manager Package: https://pub.dev/packages/window_manager
pubspec.yaml:
dependencies: window_manager: ^0.4.2
main.dart:
import 'package:window_manager/window_manager.dart'; main() async { if (defaultTargetPlatform == TargetPlatform.linux || defaultTargetPlatform == TargetPlatform.macOS || defaultTargetPlatform == TargetPlatform.windows || defaultTargetPlatform == TargetPlatform.fuchsia) { WidgetsFlutterBinding.ensureInitialized(); windowManager.waitUntilReadyToShow(const null, () async => windowManager.maximize()); } runApp(const AppWidget()); }
With window_manager you can control more things than with desktop_window mentioned earlier, like e.g. the windows title.

You can do it with the window_manager Package: https://pub.dev/packages/window_manager
pubspec.yaml:
dependencies: window_manager: ^0.4.2
main.dart:
import 'package:window_manager/window_manager.dart'; main() async { if (defaultTargetPlatform == TargetPlatform.linux || defaultTargetPlatform == TargetPlatform.macOS || defaultTargetPlatform == TargetPlatform.windows || defaultTargetPlatform == TargetPlatform.fuchsia) { WidgetsFlutterBinding.ensureInitialized(); windowManager.waitUntilReadyToShow(const WindowOptions(fullScreen: true)); } runApp(const AppWidget()); }
To have it just maximized, you have to call:
windowManager.waitUntilReadyToShow(const null, () async => windowManager.maximize());