The EIC, AE, Reviewer, or Author can see all the "Peer Review" Comments in a tab under Article Information page.
The EIC or AE can see all the peer review comments in 3 different ways:
1. Via the History: Go to the article page by clicking the title of the article > go to the history > find the correct "Status From" > click the link of Sent Message

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2. Via the Review Comment Tab: Under each article information,  you can see all the comments up to the current state using "Review Comments" tab.

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3. Via the Notification Tools: The EIC or AE can go to the "Notification" by clicking the Bell Symbol in top-right pane of the page in the journal admin. There is a list of all emails that shows all the send or received emails. Search the article ID in Search panel (top-right), and find the proper message.