A family of Microsoft word processing software products for creating web, email, and print documents.
Thank you! I don't use group policy very much, and I wasn't aware that there were such settings there.
For other readers, if you don't have the group policy administrative templates or OCT for your version of Office, you can download the appropriate file here:
Office 2013 Administrative Templates and OCT
Office 2016 Administrative Templates and OCT
After the templates are installed, run the group policy editor (gpedit.exe*) with administrator rights. In the left panel, drill down to User Configuration > Administrative Templates > Microsoft Word 2013 (or 2016) > Word Options > Advanced. The two zoom level settings are about halfway down the list on the right side.
*The Home edition of Windows doesn't include the group policy editor. If that's the edition you have, then see https://www.itechtics.com/enable-gpedit-windows-10-home/.