Deleting Annotations
Annotations on the page can be deleted using any of the below options
Delete a Specific Annotation:
- Using the Hand Tool
or Object Selection Tool 
Select the annotation that you wish to delete. - Delete the annotation by pressing the Del key, click on the Delete button
on the Mini Toolbar, or right-click on the annotation (Ctrl + Click on Mac), choose "Delete" in the context menu.
Delete All Annotations:
From the menu, choose Comments > Delete All Comments.
Delete All Annotations on Any Given Page:
From the menu, choose Comments > Delete Comments on Current Page.