Hi Sue,
Thanks for posting in the community. We are happy to help you.
Regarding your query, for Microsoft 365 products, Microsoft does provide a built-in feature to change the existing look. Please click open the Coming Soon pane from the megaphone icon in the upper right, then turn off the new experience. After that, you need to restart the Office application to check again.
For your reference:
The new look of Office
If your Office product is not Microsoft 365 products, or both two interfaces don't meet your requirement, I recommend you send feedback to Microsoft via File> Feedback> I Don't Like Something. It's the platform for us to hear your voice and improve our products.
If my understanding conflicts with your meaning, please point it out and let us know.
Sincerely,
George | Microsoft Community Moderator