Hi, KrzysiekNC
Welcome to the Microsoft community.
It sounds like you had quite an adventure figuring out how to change the language in Excel Online. Thanks for sharing your solution. Here's a step-by-step summary for anyone else facing the same issue:
- Go to OneDrive: Open your OneDrive page.
- Access Settings: Click on the gear icon (Settings) in the top right corner.
- Change Language: Find the language settings and select your desired language.
- Avoid Reverting: When a window pops up asking if you want to go to the previous page, do not click OK. Instead, click the X (Close) button to avoid reverting to the previous language settings.
It is indeed a bit counterintuitive, but your detailed explanation should help others avoid the same pitfalls. If you have any other tips or need further assistance, feel free to ask!
Additionally, you can mark this reply with a YES, which will increase the weight of this thread. This will help other users with the same problem to more accurately locate this thread and learn more about the problem.
Sincerely,
Cherry.Z - MSFT | Microsoft Community Support Specialist