Locked in Masteries(Aka Stuck unless you close league and reopen)

Not a major bug just you can't move the client once in masteries (I was beginning to use Team Builder and clicked the masteries before you searched for other members. Not sure if it only happens in these masteries). And my league was off centered (right side off screen)and so when I was done I couldn't move the client or x out of masteries so I was stuck. Had to relogg. Not a huge bug but kind of annoying. Thanks for reading this :3