Why Won't Subnautica Go Full Screen?
Try updating your graphics drivers! Sometimes outdated drivers can interfere with game settings.
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Have you checked the resolution settings in-game? Set it to match your monitor's resolution, and it should fix the problem.
You might need to dive into the config files and manually set the game to full screen. Check out the Steam forums for detailed instructions!
Make sure to press Alt+Enter while in-game; that usually toggles full screen mode. If that doesn't work, check the in-game settings for display options!
Make sure your monitor's display settings aren't interfering. Sometimes the issue lies outside the game!
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