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Excel: Page Layout -> Themes

Select the preferred visual theme or schemes.
These themes and schemes are stored in the following locations:
Path File extension
Theme C:\Program Files\Microsoft Office\root\Document Themes vv .thmx
Colors scheme C:\Program Files\Microsoft Office\root\Document Themes vv\Theme Colors .xml
Fonts scheme C:\Program Files\Microsoft Office\root\Document Themes vv\Theme Fonts .xml
Effect scheme C:\Program Files\Microsoft Office\root\Document Themes vv\Theme Effects .eftx
With VBA, these themes and schemes can be set with
ActiveWorkbook.ApplyTheme("C:\Program Files (x86)\Microsoft Office\root\Document Themes 16\Ion Boardroom.thmx")
ActiveWorkbook.Theme.ThemeColorScheme.Load("C:\Program Files (x86)\Microsoft Office\root\Document Themes 16\Theme Colors\Blue.xml")
ActiveWorkbook.Theme.ThemeFontScheme.Load("C:\Program Files (x86)\Microsoft Office\root\Document Themes 16\Theme Fonts\Arial.xml")
ActiveWorkbook.Theme.ThemeEffectScheme.Load("C:\Program Files (x86)\Microsoft Office\root\Document Themes 16\Theme Effects\Reflection.eftx")

See also

The (general) Office menu File -> Account -> Office Theme

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