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Good day Henrik,
Thank you for the detailed information and screenshots.
I tested this behavior on my side and experienced the same result. When I type in a Visio shape or text box, the proofing language automatically changes to English. After I click outside the text box, the language switches back to the language configured in Visio.
As a workaround, I recommend entering all required text first, then updating the proofing language for all relevant shapes at once:
- Press Ctrl + A to select all shapes, or hold Ctrl and select the specific shapes you want to update.
- Select the language displayed on the Visio status bar.
- Double click Finnish to set it as the proofing language.
- Run Review > Spelling when you are ready to check the document.
For further investigation, I recommend contacting your Microsoft 365 administrator and asking them to create a support request through the Microsoft 365 Admin Center > Support > Help & Support. In case you do not know who is your IT admin, kindly refer to this article: How do I find my Microsoft 365 admin? - Microsoft Support
A technical support engineer can perform a remote session to investigate the situation, verify the backend configurations, and run any necessary synchronization tools to resolve the problem. If the issue requires further attention, they can escalate it to a specialized team for deeper analysis.
As a fellow user in this community forum, I can only share public documentation, testing observations, and general troubleshooting guidance. I don't have access to internal diagnostic tools, engineering investigations, or product development records, so I cannot determine whether this behavior is a known product issue.
Alternatively, I understand that contacting your organization's IT admin may not be convenient, you can submit feedback through the Visio · Community. This is the most effective way to ensure your voice reaches the product team and can be considered for future improvements. Once you've submitted your feedback, feel free to share the link here in the comments. I’ll be happy to upvote it to help bring more visibility.
Also, as many members of the community may not yet be aware of this behavior. Sharing or highlighting this response can help bring greater visibility to the issue, making it easier for others who are experiencing similar challenges to find relevant information.
Thank you for your patience and understanding.
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