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Year of Linux on the Desktop
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Try switching Witcher 3 from using fullscreen to borderless window or the other way around, that fixed the fullscreen issues for me, it's just the game getting confused about whether it has focus or not. That was before the update though haven't tried since then.
That's a general proton issue though and not NixOS, fullscreen just is fickle on windows and that extends to an emulated windows.