In Windows, Built-in Administrator Account is hidden and disabled in default when you are installing windows 10. You can able to Enable and Disable the Bulit-in Administrator account. if you want to enable the Administrator, you must be a user administrator. Just follow the simple step to Enable or Disable the Administrator Account in Windows 10.
Let See,
How to Enable or Disable an Administrator Account
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Right-click “This PC”
2) Select and go to “Manage”
3) Select and Expand “Local User and Groups”(Shortcut go to “Run” Command and type “lusrmgr.msc”)
4)Select Goto “User”
5) Right Click “Administrator” and click “Properties”
6) Uncheck “Account is disable” and also make sure “user must change the password at next login” is in uncheck.
7) Click “Apply”.
8) If you want to disable Administrator, Click “Account is disable” and Click Appy.