When I’m designing I prefer to have all my screens on a single page so I can periodically zoom out and make sure everything is consistent. However if my project gets too big I might have to spread the work over multiple pages to ease resource constraints.
Perhaps a solution to this could be page thumbnails. Ability to browse thumbnails of pages could make it easy to quickly get an understanding of the state of each page.
Maybe a toggle in the left navigation to switch between list view and thumbnail view could work or a thumbnail browser.. though a thumbnail browser might be better suited for the plugin ecosystem.