How to Change Undertale Screen Size
Simply press F4 on your keyboard to toggle between fullscreen and windowed mode. Easy peasy!
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You can also resize the window manually by dragging the edges if you're in windowed mode!
Go to the game's Settings in the title menu, and you can adjust the screen size there.
Just hit F4. Magic happens.
I found resizing the window by dragging the corners works best. Keeps things flexible!
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