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On the File tab, select Options.
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Select the Language tab and:
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Under Office display language, choose a language and select Set as Preferred.
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Under Office authoring languages and proofing, choose a language and select Set as Preferred.
Note: If you don't see the language you want, select Add a language and select Add. The new language appears in the list of editing languages so you can set it as the default.
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On the Review tab, select the arrow next to
Editor and select Set Proofing Language.
Note: If you'd like to change the display language for everything you see in Office for the web, see Change the language Office uses in its menus and proofing tools.
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On the Tools tab, select Language.
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Select a language. Check or clear Detect Language automatically or Do not check spelling or grammar.
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To make it default, select Default, choose Yes. and select OK.