Yes, I meant the quick use slot. I can't seem to get an item out of there that I didn't mean to put there. I have tried (on Windows) using shift, ctrl, alt, right and left clicking with those and they just will not come out. I've tried simply placing something else over them to swap out but that won't work either.
The spells are easy enough to swap but .. maybe I'm missing something with this quick use. *facepalm*