Change the default language via Review tab | Language | Set Proofing Language. In the dialog box, be sure to clear the "Detect language automatically" check box. When you are done, click the Set as Default button.
Note that changing the default does not affect existing documents. You may have to select all content and manually specify the language for the selection, again via Review | Language | Set Proofing Language.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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