How to Expand Undertale Windowed
You can expand Undertale in windowed mode by simply dragging the edges of the window! Just click and drag the borders to your desired size.
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If none of that works, go into the game's settings and change the resolution manually. Sometimes the old-fashioned way is the best way!
For a bigger window in Undertale, you can also press F4 to toggle between full screen and windowed mode.
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