Ok... It is not uncommon for a Windows license to only support one display language.
Alternatively, you can try installing a language pack, which may allow you to use multiple languages in the UI. However, keep in mind that language packs are not available for all versions of Windows, and they may not provide complete translations of the UI.
If you want to use a different language for certain programs or apps, you can usually change the language for those individual programs or apps. However, the overall UI of the operating system will still be displayed in the language specified by your Windows license.