Before proceeding, please ensure that you are familiar with Reviewing a Proof – The Basics.
From the History side panel, click the Pop out icon to open a new browser window displaying your selected proof version.
Alternatively, click and hold the Eye icon to view the previous proof version and then release your hold to view again the current proof version.
From the History side panel, click Comments link for your selected proof version.
The previous version's comments will display in the side panel and the comment tools that were used will be overlaid on your current proof version.
Note: Collaborators can only view versions and comments on proofs they have been invited in.