In Word for the web, you can click on comments to delete them while you view or edit a document. The first step depends on whether you're in Viewing mode or Editing mode. By default, documents open in Viewing mode.
In Viewing mode
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Select a comment balloon to see the comment and open the Comments pane.
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In the Comments pane, select the comment you want to delete.
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From the More threads action (...) menu, select Delete thread.
In Editing View
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Select Show Comments from the Review tab.
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In the Comments pane, select the comment you want to delete.
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From the More threads action (...) menu, select Delete thread.
For more info about reviewing documents in Word for the web, see Insert comments in a document.
