Can we change the webinar wallpaper during the webinar?

Hi, @UserIns231123.

Normally, settings made on the Zoom Web Portal (zoom.us) take effect on start of the webinar, and either can't be changed while a webinar is in progress, or don't change anything in an in-progress webinar.  Since this is a "webinar setup" type of thing, I'm guessing "what you set is what you get."