WINDOW TOO BIG

Opened the game to a huge window so I had a small part of the screen being huge. When I tried to window size down it does so, cutting some edges. That way when I opened settings while in champion select I couldn't close the setting window because it was cut off. Lost LP for ditching, and when I reopen the same problem occurs. So basically, I can't even play at all now. Please FIX, tired of loosing LP and not being able to actually get in game. Thank you