How to Fix Roblox Fullscreen Not Working
First, try pressing Alt+Enter or F11. If that doesn't work, go to Settings in-game and toggle the Fullscreen button!
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Right-click the Roblox shortcut, go to Properties, and in the Compatibility tab, disable fullscreen optimizations. Worked for me!
Make sure your graphics drivers are up-to-date. Sometimes, an outdated driver can mess with fullscreen settings.
Have you tried turning it off and on again? Restarting the game or even your device can solve a lot of these issues.
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