I tried multiple styles that I have just now and they all do the same thing. Even having Curtains running and selecting the Windows 10 style doesn't fix it. Only way I can get the black bar to go away is to disable the Curtains service in services.msc & restart. As soon as I enable & start the service, the issue comes back.
For the style in the screenshot, I am using "New Acrylic" by Austin.