YSK because this can help with the smaller quantity of content Lemmy has. Coming back to older threads to look at new comments to ongoing discussions is a way to solve that issue.
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Where? How?
Then threads with new comments will show up at the top
It’s a sort function. Check the app you’re using, where you would sort comments, there should be a bunch of options. Hot, active, New, old, etc., are all sort option.