Hi, Psyonic
Welcome to Microsoft Community and thank you for sharing your concern with us today.
I understand that you want to change the display language of Windows 11.
Knowing about that your system version is Windows 11 Home, Single Language..
If you want to change the display language, you can go to Microsoft Store to subscribe Windows Pro.
I hope the information provided is useful for you. If you have any additional questions, please do not hesitate to reach out to our support.
Best Regards
Clara Geng | Microsoft Community Support Specialist