When viewing discussion thread replies, you can collapse and expand the discussion thread replies sidebar. When a discussion thread reply is collapsed, you can view the reply indicators showing the number of unread and total replies
To expand the discussion thread replies sidebar, click the # of replies link [1].
View the read and unread replies [2].
To view older replies, click the Show older replies link [3].
To view threaded replies options, click the Options icon [4]. You can mark replies as read/unread, mark threaded replies as read/unread, return to the topic, edit the reply, delete the reply, or open the reply in SpeedGrader.
To collapse the discussion thread replies sidebar, click the Close icon [5].