If you haven't done so, first see whether restarting the Mac resolves it. If not...
Without descriptive details [preferably screenshots] it's difficult to be sure but it sounds like it may simply be a matter of the view being used. Go to the View menu or the View tab of the Ribbon to make sure that Print Layout is selected.
If that isn't the remedy please provide a screenshot of the entire document window & include the present Version Number of macOS.
There is nothing an Office update can do to affect the documents, themselves. It's most likely a Preference or display setting. Please don't succumb with the possible replies which jump right to a scorched earth policy of ripping out the software & reinstalling it.