I'm sorry to say that I couldn't find a way to move the notebook pages and I had to re-create my notebooks too after I found out they weren't syncing and then became corrupt. There were so many iterations of OneNote, first saved the on the hard drive, then OneDrive Personal, then OneDrive for Business Groove.exe, then OneDrive for Business and finally SharePoint.
Ran into what you are experiencing a long time ago when I first started using OneNote.