2. In the Revision function, you can select the Insert or Delete function, and then perform the corresponding operation in the document. These actions are automatically marked as revisions for others to see.

3. If you need to view the modified contents, you can select the Review tab in the menu bar, and then select the Modify option in the Show Markup drop-down menu, so that you can see all the modified contents.

4. If you need to display the modified contents in the box on the right, you can select "Show Markup" in the "Revision" function, and then check the "Comment" option. In this way, a comment pane will appear on the right side of the document, showing the insertion and deletion operations.