Hello Buseni Jean Damour,
Thank you for posting in Q&A forum.
We can see information below in the link below:
Unlike some previous releases of Windows Server, you cannot convert between Server Core and Server with Desktop Experience after installation. You will need to do a clean installation if you install later decide to use a different option.
Server Core vs Server with Desktop Experience install options
https://learn.microsoft.com/en-us/windows-server/get-started/install-options-server-core-desktop-experience
Hope the information above is helpful.
If you have any question or concern, please feel free to let us know.
Best Regards,
Daisy Zhou
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