Dear Dave,
Good day!! Thanks for posting your concern in this Microsoft Community.
Per the description shared, I understand your concern and I would like to suggest you to check whether Word app is having Full Grant Access permission on the System Preferences on the Mac.
Click on the Apple icon in the Menu bar> System Preferences> Security & Privacy> Privacy> See whether the Word is present and if it's not, please click on the + and add the Word app to see the outcome.
If it's added, please restart your Mac and check the outcome. If the problem persists, please launch your Mac in the Safe Mode and check the outcome. Reference: How to use a "clean startup" to determine whether background programs are interfering with Office for Mac - Microsoft Support
If the problem persists, I would like to confirm whether the problem is happened after updating the Office apps to the latest version.
Thank you for your patience and understanding.
Sincerely
Mia | Microsoft Moderator