@wumpus is there a way to add a user to an existing multi-user PM chain, or do I need to start a new one? I saw a topic on Discourse Meta that implied it was possible, but I’m not seeing the option in question on my screen. But might just be missing a SUPER obvious button.
Pretty sure the dismiss button on the unread tab does that, actually. Try it.
The question seems to be “how can I reset unread post count in a topic back to zero” not “how can I make Discourse think I never, ever, entered the topic.” Re-reading the Q just now, it seems either thing I suggested will work… and you DO NOT need to go to the bottom of the topic to do it!