Hi - don’t know if you’ll fully get the answer you need but if you click this link and type in your search terms (‘flow’ or ‘page numbers’ as here for example), some meaningful pointers are returned…
Cubase Pro 15.0.30 Score Editor • Viewer • Steinberg
There seems some related info in this thread worth reading:-
Score editor does not show title on other pages (bug?) - Cubase - Steinberg Forums