The default Excel theme is the Office theme.

Name: The default Excel theme is the Office theme.
Brand: Quizplus
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Quizplus · Accepted Answer

The default theme for Excel is indeed the Office theme. This theme matches the default theme for all other Office applications, providing a consistent look and feel across programs. However, users can customize their theme preferences by selecting from a variety of other built-in themes or even creating their own custom themes.

The Default Excel Theme Is the Office Theme