Hello Carolyn,
I am Jaenise, a Microsoft Community Independent advisor and a Microsoft Office user like you. I hope I can help you with your concern.
Please try to perform office repair to fix any issue within the application. Open the link below and follow the steps provided on how to do it.
https://support.microsoft.com/en-us/office/repa...
Please let me know if the issue is fixed or still not.
Please let me know if you need more assistance.
Stay safe & have a nice day.
Sincerely,
Jaenise