After all these years, Gmail for Android gets a feature it needed from day one
TLDR: a select all button
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Mark as Read in the notification panel. How the hell is that still not an option? I've been asking for this over a decade since quick reply options became a thing (jellybean?). Options are still only Archive or Delete.
I don't even get delete. Just archive running pixel 8
Inside Settings in Gmail you should be able to swap it, but you can only have one of them at a time. Another genius decision.