When you remove an enterprise member from your enterprise, the member is removed from all organizations owned by your enterprise.
If the enterprise member you're removing is the last owner of an organization owned by your enterprise, you will become an owner of that organization.
If your enterprise or any of the organizations owned by your enterprise uses an identity provider (IdP) to manage organization membership, the member may be added back to the organization by the IdP. Make sure to also make any necessary changes in your IdP.
Note: If an enterprise member uses only GitHub Enterprise Server, and not GitHub Enterprise Cloud, you cannot remove the enterprise member this way.
In the top-right corner of GitHub.com, click your profile photo, then click Your enterprises.
In the list of enterprises, click the enterprise you want to view.
In the enterprise account sidebar, click People.
To the right of the person you want to remove, select the dropdown menu and click Remove from enterprise.