It might be good idea to back up AppData/Local/Autodesk/ENU folder.

More than once 3ds Max has became weird with loss of shortcuts and similar. Always the remedy has been resetting Max by removing the settings files. Having to set up everything again from scratch is a pain.

I asked this from Autodesk forums and they said it’s basically a fine practice, so I assume nothing should go haywire if I was just to move the folder back if something happens.

Especially losing shortcuts in UV editor window has been a nuisance in 3ds Max 2020.