You can check out anytime you like, but you can never leave.
How do I quit chess.com?

Or you could reach out to Help & Support to see if they might be able to help you with the underlying issue. They're very responsive here.

Click the X in the top right hand corner of your browser.
I was going to give this answer, but I'd say "top left". Please adjust according to where it is for you ;)
After some issues with live chess I am taking serious consideration into leaving chess.com. Does anyone know how I would go about doing this?