PDF (adobe.com)

Rename or delete an item in a pop‑up panel

 Select an item, click the triangle in the upper right corner of the pop‑up panel, and choose one of the following:
Rename Tool Preset
Lets you enter a new name for the item.

Delete Tool Preset
Deletes an item in the pop‑up panel.
Note: You can also delete an item in a pop‑up panel by holding down Alt (Windows) or Option (Mac OS) and clicking the item.