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Well, my between the lines conclusion is that he assumed there was one. I personally don't remember ever seeing an exit button in CCS, therefore it can't be brought back, as it never existed. So I take this as a suggestion for them to introduce one. 🤔
It would be handy indeed. Especially now with this stupid enforced fullscreen mode.
In case your post is more about being unable to leave the app than getting a designated exit button, you could slide your finger from the top of your screen down a bit in order to activate the notifications bar as well as the virtual navigation keys at the bottom for a couple of seconds, which should give you enough time to press the "Back" or "Home" button.
Otherwise I support your request for an "Exit" button in-game. 👍
Have fun! o/