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Hello @Björklund, Erik
I recommend checking the language configured in your browser, as websites can also use the browser's preferred language. Please try the following steps depending on the browser you use:
1/ For Microsoft Edge
- Open Microsoft Edge and select Settings and more (...) > Settings.
- Select Languages.
- Under Preferred languages, add your preferred language if it is not already listed.
- Select the ... next to the language and choose Display Microsoft Edge in this language when the option is available.
- Restart Microsoft Edge to apply the change.
2/ For Google Chrome
- Open Google Chrome and select the menu in the upper-right corner, then select Settings.
- Select Languages.
- Under the language preferences, select Add languages if your preferred language is not already listed.
- Add or move your preferred language to the appropriate position in the language list.
- Close and reopen Chrome if necessary to apply the change.
After changing the browser language, please close and reopen the browser to check whether the Microsoft 365 pages are displayed in the expected language.
I hope this information will be helpful. If the display language still does not change, please feel free to share an update with me.
If the answer is helpful, please click "Yes". If you have extra questions about this answer, please click "Comment".