If you are saying that you are typing/editing documents in different languages, you shouldn't change the display language but rather the language of your text; that way, you get the correct spellchecking.
That said, I don't know why the display language changes on its own. It clearly shouldn't, unless you picked the option that matches the language of Office with that of Windows.
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Stefan Blom
Microsoft Word MVP
Microsoft 365 apps for business
Windows 11 Professional
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