Window moved around (how?)

I feel really silly even having to ask for help with this one, but I’ve managed to get a single game in an odd state and I can’t for the life of me figure out how.

I was attempting to edit the Menu controls (button mapping) for a specific MAME game in the same way I have a hundred times before when suddenly pressing a button began moving the ENTIRE screen around monitor.

It landed on the bottom of the screen half cut off and I can’t get it fixed. I assumed it must have just been the resolution setting or the cocktail / standup config in the game settings - but that’s not the issue.

Does anyone know what this is (or even just how to reset config settings for a specific game?

Thank you in advance!

if it’s a MAME OSD option that put it like that, you can delete the ini in saves/mame.