If you want to set it Full Screen at startup, just after "this.InitializeComponent();", you can call :
Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TryEnterFullScreenMode();
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How to maximize uwp window on startup programmatically? I want maximize my window after startup, because it started minimized and suspended. Its possible?
If you want to set it Full Screen at startup, just after "this.InitializeComponent();", you can call :
Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TryEnterFullScreenMode();