Ben, Go to Edit>Preferences. In the moment the Preferences panel is open, have look to the lower left part, there is a button called “Open Preferences Folder…”
There is also the path of it (right sided)
In this folder is a folder called “prefs”, inside of it is file “CINEMA 4D.prf”
Restart after placing this file out of reach (I typically zip it and store the zip on an USB-drive and trash the prefs), deleting might be an option as well, but if the “trashing” isn’t helping, you might want to replace the new version with your setting.
Again, this is all Support work, but somehow I think telling where the prefs are is OK. :o)
Have a good one
Sassi