Add notes as annotations
The most common type of comment is Note, which lets you direct the attention of readers to a specific area of page. For instance, you can add a note anywhere on the page and type text in the associated pop-up note for other reviewers to see.
To add a note
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Open a PDF and choose Comment > Basic Tools > Note
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Click on the page where you want to place the sticky note and then a pop-up note appears. You can also format the text in the Popup tab which appears when you type in it.
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To show or hide the pop-up note:
To hide a pop-up note
To show a pop-up note
Note: right-click on any of the existing comments and select Open All Pop-Ups/Minimize All Pop-Ups from the options to show or hide pop-up notes of all comments instantly.
To edit note properties
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Right-click on the sticky note and select Properties….
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On the Display tab of the Note Properties dialog box, edit the visual characteristics of the note, such as Icon, Color, and Opacity.
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On the Author and Subject tab, you can edit the Author and Subject details for the note.
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On the History tab, you can view all changes made to the comment.
Note: you are able to click-drag the sticky note icon and move it anywhere on the page of the document.
To reply to a note
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If the pop-up note is hidden, double-click the note icon to make it appear.
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Right-click on the pop-up note and select Reply from the menu options.
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An additional pop-up note appears inside the original one. You can then write your response in it.

Note: you have to double-click the note icon to call out the associated pop-up note unless you allow Automatically open comment pop-ups in Preferences.