View comments
You can view all the comments added to the PDF document in the Comments panel that provides a toolbar with commonly used options, such as searching, sorting, filtering, and more.
To open the Comment panel
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On the Sidebar Navigation pane, click on the Comment icon.
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You can then use the options at the top of the Comment panel to work with comments, such as adjusting comment viewings, deleting, filtering, sorting, searching, and more.
To expand or collapse comments
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On the Sidebar Navigation pane, click on the Comment icon.
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In the Comment panel, do any of the following to expand or collapse comments in panel:
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To expand or collapse all comments, click the Expand all elements in panel (B) or the Collapse all elements in panel (A) button.
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To expand or collapse individual comments, click the + or - button to the left of comment.

Comments are expanded already (Left) A. Collapse all; Click the Collapse all elements in panel button (B) to expand all comments. Comments are all collapsed (Right).