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On the Design tab, selectÂ
 Themes. -
Hover your mouse pointer on a theme to see its effect on your document.
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Select a theme to apply it.
Applying a theme isn't currently possible in Word for the web. You can, however, apply a theme in the Word desktop app.
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To open the desktop app, at the top of the ribbon, select Editing > Open in Desktop.
Don't have the Word desktop app? Try or buy Microsoft 365.
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On the Design tab, select
  Themes. -
Select a theme to apply it.