I found a way to change color to fully transparent, by researching structure of DesktopWindowXamlSource of Taskbar (Shell_TrayWnd).
DekstopWindowXamlSource structure:
I’m curious is it possible to somehow change BackgroundFill in DesktopWindowXamlSource to Windows.UI.Xaml.Media.Brush with value of transparent by writing some C# Code.
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