The program is called MediBang Paint Pro, I cannot move or close this black window/overlay, it prevents me from drawing on the canvas as well. When I close the app, the black window/overlay closes with a delay, I try to disable all the Windows but it's still persistent there Ubuntu 24.04 LTS, Wine 9.0
I'm not familiar with MediBang, but have you checked out Ubuntu-native programs like Inkscape, Krita, Gimp, Pinta which could run without Wine?
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