How to remove accent color in title bar of the window when that option is enabled in Windows 11 22H2?

Question

In Windows 11 22H2 Microsoft changed how option

Settings > Personalization > Color > Show accent color in title bars and windows borders

works (compared to 21H2). Now it is forced on all windows. Is it possible to disable it on custom windows?

I expected that CaptionHeight would control this, but makes no difference.

<WindowChrome                    
    CaptionHeight="0" 
    GlassFrameThickness="-1"
    UseAeroCaptionButtons="True" />

TitleBar.Height is not changeable.

Any other suggestions or is it a bug in Windows 11 so the Mica effect can be applied on the entire window including the title bar?

Answer 1

You could use the AppWindow class in the Windows App SDK to change the colour of the title bar, e.g.:

Microsoft.Windows.ApplicationModel.DynamicDependency.Bootstrap.TryInitialize(0x00010000, out _);
var hWnd = new System.Windows.Interop.WindowInteropHelper(this).EnsureHandle();
var windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(hWnd);
var appWindow = Microsoft.UI.Windowing.AppWindow.GetFromWindowId(windowId);
if (appWindow != null)
{
    appWindow.TitleBar.BackgroundColor = Microsoft.UI.Colors.Red;
}