You can use the Area Highlight command to mark important area as a means of memory retention or for later reference.
To add an area highlight comment,
1. In the Comment tab, select Area Highlight. Then click and drag to make a shape you want to mark up.
2. (Optional) Change the appearance of drawing markup comments in the Comment Format context tab that appears when you choose a drawing markup tool.
3. (Optional) Double-click the markup to add a text message in the pop-up note for the markup.
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