Within Excel >File >Options >Personalise set the background and theme as required
And in your unknown win version >Themes/Contrast
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I started using Office 365 a few weeks ago. Since then, all my excel sheets are black. I read forums which said to turn on high contrast, which I did, but that just turns the sheets all white, and I can not see any fill colors. How can I get the sheets to show white and the fill colors to show?
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Within Excel >File >Options >Personalise set the background and theme as required
And in your unknown win version >Themes/Contrast