I cant close league, its stuck on a black screen. (Mac)

I can hide the screen, but I cant close it. I also cant switch accounts or shut down the computer, I have to close it first. Please help.
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We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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