Would like to have the ability to LOCK X and Y coords of all controls/input boxes/buttons and icons when in edit mode to prevent from 'accidental' movement. Myself and my team have had countless situtations working on multiple monitors where clicking back in to the PowerApps studio will slightly move a label, button, icon etc.
A simple "Lock-All" checkbox as well as the granular approach of being able to lock individual components within the Tree View so that once they are set in their "Pixel Perfect" location, they will stay there for good.