Cannot Accept Match when League of Legends application is moved off screen partially.

I am unable to "Accept Match" because I moved my League window off to the side of my screen. The dialogue for accept match takes focus, and I am unable to move the application back in to view to accept. There is no reason I can think of why the accept dialogue needs to take exclusive focus like this. If it is necessary, the option to press "return" to accept the match would help, but that did not work either.