Hi Uplinkxc,
Thank you for reaching out. My name is Leo, a user just like you. I'd be happy to help you with your concern.
May I know which Microsoft Office version you are currently using? Also, could you provide details about the changes that were made that might be causing the issue? Have you made any updates or modified any settings? It would be very helpful if you could provide a screenshot of the issue for better understanding.
If you are referring to the color scheme of the tables, you can manually modify it or use the formatting table under the Home > Styles ribbon. If you are referring to the Excel window color theme, you can change it via File > Options > General, and then change the Office theme.
We will wait for your response to assist you further. In case you still need additional help, please don't hesitate to let us know. We, the community users, are always here to help. Thank you!
Your understanding and patience will be highly appreciated. I hope I provided a helpful information regarding your concern! Let me know if you have any further questions. Be safe always!
Best Regards,
Leo