Microsoft Office Questions? Ask a IT Expert for Support ASAP
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To answer your question ->
Seems like you have a Document Theme setup. I suggest you to change the theme On the Page Layout tab in Excel or the Design tab in Word, click Colors, and then click Customize Colors.
More info - https://support.office.com/en-us/article/change-a-theme-and-make-it-the-default-in-word-or-excel-c846f997-968e-4daa-b2d4-42bd2afef904
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