Libreddit does this, and it shows a pointer when you hover over the bar/header where the username and upvote count are, to indicate that you can collapse the comment by clicking.
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I mean there’s a dedicated icon buttom for it. I see the idea and enjoy that Jerboa collapses posts when you click on them, but I don’t mind clicking the button in the web interface.
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Make it optional please. I don’t want this to be shoved into my face.