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Whenver I try to change the resolution in-game in the video options, the bottom half of my screen goes black. I can move my cursor in and out of the black part of the screen, but I can't interact with anything that's being covered with the blackness.
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You can try to do it manually:
This way you will also be able to choose a custom resolution e.g. widescreen ones like 1336x768 or 1920x1080 ;)