how to leave a club?

can someone help me? You know that feature with "clubs" where you create the said club and afterwards everyone who's in the club will be in a chat. That chat will always open up every time you start up league. Is there a way to stop it? me and my m8t's don't play anymore and i always see the chat pop up. when i click on the gear in the chat (top right) there's an option to "autojoin on startup" but i cant un-click it. halp (btw im not in any teams)
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