Page size for new documents in Word for Mac 16.26

Until yesterday, every time I open a new document in Word for Mac, or open a Word document attached to an Outlook email, it has always opened at maximum size. Now it only opens to cover about a quarter of the screen and I have to manually enlarge it before typing.

I searched and tried even old advice for changing this behavior, but nothing works.

When I create a new document, I want it to be as large as possible, with the various menu bars still visible. Any help would be appreciated. Thanks.