Add an editing or authoring language or set language preferences in Office - Office Support
https://support.microsoft.com/en-us/office/add-an-editing-or-authoring-language-or-set-language-preferences-in-office-663d9d94-ca99-4a0d-973e-7c4a6b8a827d
To set the default language: Open an Office program, such as Word. Click File > Options > Language. In the Set the Office Language Preferences dialog box, under Choose Display and Help Languages, choose the language that you want to use, and then select Set as Default.
Open an Office program, such as Word.
Click File > Options > Language.
In the Set the Office Language Preferences dialog box, under Choose Display and Help Languages, choose the language that you want to use, and then select Set as Default.
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