なんかすぐに忘れてしまうのでメモ.
App.xaml.cs
に以下を追加.
public partial class App : Application { public App() { InitializeComponent(); MainPage = new AppShell(); } protected override Window CreateWindow(IActivationState activationState) { var window = base.CreateWindow(activationState); window.Title = "MauiAppTest"; window.Width = 800; window.Height = 600; return window; } }