Thank you for the provided screenshot.
To remove the transparent effect, you can use the ThemeEffectsHelper
custom class and its attached property IsAcrylic
The transparent/blurred effect is only available on Windows 10. In any other operating system it would result in a transparent Window.
You can read more on the Fluent article under Visual Effects Helpers
Attached, you can find a sample project in which I've set the ThemeEffectsHelper.IsAcrylic
property in MainWindow.xaml
and set it commented in App.xaml.cs
in case you want to use apply it globally.
I hope you find this helpful.
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