How to Enlarge Undertale Window
Easiest way is to press F4 while in-game. Bam! Fullscreen mode.
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You can also go into the game settings and look for a fullscreen toggle or window size option. Ctrl + Enter might work as well!
I had the same issue! For me, F4 or Alt + Enter did the trick to fullscreen the game. Enjoy!
Just hit F4. Don鈥檛 overthink it.
Honestly, just use F4. If that doesn't work, try Alt + Enter. But, trust me, F4 almost always works.
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