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Hello Gene Pruitt
Thank you for posting on Microsoft Q&A forum
I can see that you are currently can't change your cell color in Excel Work sheets
Can you describe more detail what happen when you attempt to change the cell color? If possible, can you take a screenshot when the issue happens? It could help me better understand the problem you are facing.
Also, when you said header, which of these headers are you referring to:
- The printed Header/Footer (the area at the very top/bottom when printing)
- The Header Row of your data / Table header (Row 1, or the bold header row in an Excel Table)
- The row/column headings (the A, B, C at top and 1, 2, 3 on the left) or the highlight color of those headings.
I hope to hear update from you soon.