Roblox default UI bug

Hey so, I wasn’t exactly sure where to put this, and this is the closest category I could find to my issue. This isn’t a studio bug, but rather a in-game bug. I tried restarting my device, deleting and re-installing Roblox, none of which worked. My problem is that the Roblox UI is extremely small and I can only access the upper left portion of the Roblox window. Does anyone know how to fix this? I asked my friends and they said it was all normal for the.

(edit) you can see that my mouse stayed in the upper left corner the whole time in the gif.

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