2. View "New Annotation" on the toolbar in the execution menu.
3. Click "New Label", enter the label content in the pop-up label box, and then click the mouse outside the label to complete the operation of inserting the label.
4. Click Show Markup on the review toolbar to pop up the shortcut menu. A checkmark means "Show Comments".
5. If you click the "Show Annotation" command again, a shortcut menu will pop up, and the tick mark on the annotation item will be removed, indicating "Hide Annotation".