I've already explained:
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When you right-click a highlight or a note in the body of the PDF, this popup menu appears.
When you right-click any note or highlight in the Annotations pane, this popup menu appears.
As you can see, the popup lists each contain similar items and a few different items. In addition, you have some buttons on the Annotations pane together with a search field.
In the next post, I'll start talking about what you can do with each of these options.