public async void EnterFullScreen()
{
await Task.Delay(100);
ApplicationView.GetForCurrentView().TryEnterFullScreenMode();
_splitView.AnimateDoubleProperty("CompactPaneLength", 48, 0, 250);
_commandBarT.ClosedDisplayMode = AppBarClosedDisplayMode.Hidden;
_commandBarB.ClosedDisplayMode = AppBarClosedDisplayMode.Hidden;
_toggle.Visibility = Visibility.Collapsed;
_exitFS.Visibility = Visibility.Visible;
_panes.Margin = new Thickness(0);
}
