Not only this, but it also fixes common game problems like lagging and low FPS issues. This boosts the game by optimizing the system resources and offers better gameplay. If your game is lagging or stuttering then optimize your gaming performance by running Game Booster. Best Way to Optimize the Game Performance on Windows 10: So, in this way you can easily take up your Undertale from Windowed screen to full-screen mode easily. Instead, you can also press the F4 key individually and see if this works for you.
#UNDERTALE EMULATOR MAC HOW TO#
But if you are running the game in Mac OS and wondering how to make it fullscreen on Mac then run the below-given commands. This is pretty much easy to make the game in fullscreen in Windows OS. Pressing these two keys at the same time switches the windowed mode screen to fullscreen mode for some PC games as well as the Undertale.