Problem details:
I hate UI-scaling I keep accidentally fatfingering some stupid keybind mid-game fucking up my entire UI by 5%. Is there a way to disable this shortcut?

osu! version: Stable 2025.316.0-Lazer

If you mean the toolbar you can go to Input -> Configure and search toolbar and clear it so it has no keybinding.
If it's not that you can still see all keybinds there

For now the UI scale keybinds are not adjustable unfortunately but we know that people want them to be.

Relevant github thread is https://github.com/ppy/osu/issues/31360