Page View only displays the top 1" of the page. It only shows the title or page number.
Reproduced on Surface Book 3 only. This is regardless of running in tablet (1 graphic card) form with keyboard detached or with the keyboard attached (two graphic cards.)
Just open an existing score or create a new one. With page view mode selected by default, only the very top of the page is shown. The page size seems to be just about 1" in length and full page width.
This is a regression from earlier version (3.5) and is not reproducible on regular laptop. The problem persists even after reinstalling the 3.5 version. So, it could be a bug in one of the linked libraries that doesn't got removed and reinstalled with the earlier version.