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Select the ellipsis (...) next to your initials or profile picture at the top of the app.
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SelectÂ
 Settings and then choose  General. -
Under Language, select Choose Teams app language. and choose a language in the drop down.Â
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Restart Teams to set your language and update the time and date to your new language.Â
Tip: Select Follow Windows OS settings to manage Teams with the rest of Windows.Â