I cannot figure out how to work on the design and content of a site upgraded from X to Pro. When I launch Pro and add bars and sections and elements, nothing at all appears in the preview area except uneditable “boxes” and a menu section that was there already when I clicked on the Header builder. I actually clicked on “Blank” under the Header menu, but preexisting content appeared in the preview area and I could not get rid of it or edit it.
Daniel