Go to View tab » Schedules ▼ Schedule/Quantities, and create an Electrical Circuits Schedule. In the following dialog box, select the desired fields (i.e. "Circuit Number", "Load Name"), but you must include the "Panel" field in order to filter the schedule to show only the circuits from that panel - under the Filter tab, set "Filter by:" to "Panel", equals, and enter the panel's name. This will report the Electrical Circuits that belong to that panel.
If you are aiming to list all of the individual elements that are connected to that Panel, I don't believe that you can in a single Schedule. You could list the elements of a single chosen Category (i.e. Electrical Fixtures) through the use of an Embedded Schedule to the Electrical Circuit Schedule.
Corey D. ──────────────────────────────────────────────────────────────────────⁞|⁞ Please use .Accept as Solution and Give Kudos as appropriate to further enhance these forums. Thank you!