How do I change my display name in a Zoom webinar with no participant list displayed?

The only way that I can find to change my Zoom display name through the (Windows) desktop app is to go to the participants list. But at Zoom webinars (as opposed to meetings), the participant list is often (or always?) hidden. How can I change my display name in this situation? Although other participants cannot see my display name, the organizers can, and I believe that the other participants might be able to see my display name if I ask a question.