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. Hit ALT + ENTER keys – This is another powerful keyboard shortcut that makes the Undertake fullscreen on Windows.So, here you need to press the FN or functions key generally located on the lower corner of the keyboard along with the F4 key.
The users who are playing Undertale on Windows PC/laptop, follow the below-given shortcuts and if one of these shortcuts won’t work for you then try the other options: How to Make Undertale Fullscreen Windows 10, 8, 7? Here we have listed the steps for both Windows as well Mac OS, make sure to follow the commands as per your computer and force the game to open in fullscreen.
