This widget let's you see/leave comments with regard to the document, or a segment in particular. This is also used to see the revisions made for segments.
Leave a comment
To leave a comment for a specific segment, enter this segment and click on the comment icon. This will open the Timeline (if hidden) and you will be ready to enter your comment:
On the other hand, if you wish to leave a comment for the document in general
Select a comment category (if needed)
See segment revisions
Search for a comment