Hi @mohamed abdmouleh ,
This forum mainly focus on the issues related to Exchange Server.
From the description, I understand that issue is more related to Windows machine user account administration. If not, please share the exact issue you are facing with Exchange server administration.
References for changing account type:
https://www.top-password.com/knowledge/change-standard-user-to-administrator.html
https://answers.microsoft.com/en-us/windows/forum/windows_10-security-winpc/change-from-standard-user-to-administrator-user-on/ad62ef6f-717c-4ff9-b86d-22e6a1359bbe
If the above suggestion helps, please click on "Accept Answer" and upvote it