How to Fix Sonic Mania Full Screen Issue
Just press Alt + Enter, problem solved.
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To fix Sonic Mania's full-screen issue, try changing the display settings in the game's options menu. Alternatively, you can toggle full screen by pressing Alt + Enter while in the game.
I had this issue too, and going into the settings and adjusting the video resolution manually fixed it for me!
If full screen isn't working, check if your display drivers need updating or if there's a game patch available.
馃憖 If you like Sonic the Hedgehog...
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