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by DoreenMichele 1882 days ago
You can click on the minus sign in the comment to collapse it and all replies to it. You won't see new replies to old comments but you will see only new top level comments for that discussion (assuming you've collapsed all comments so far).

The minus sign is in brackets like this: [ - ]

After you click it, it says "x number of replies" basically (in the form of the number of replies and the word more).