For replying to comment, the Comments column must be displayed. The visibility of the comments column can be toggled with the User Comment tool in the Preview toolbar.
To reply to a comment:
1. On the comment that you want to reply to, click the reply icon (). A new entry field is added below the comment. The entry field is activated.
2. Enter the text for the reply, then click Post reply.
The reply is saved and is immediately available to other users.
in the Preview toolbar.
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