You might need to revoke admin access if you no longer want someone to have it or to terminate their profile. You do this the same way as giving a user admin access.
Go to an employee's profile.
On the Employee tab, scroll down the page until you get to Access level.
Underneath the Access level field, click the dropdown and change it from Administrator to Employee.
Scroll down to the bottom, then click Save.
Go to your settings, then click Permissions, then Roles settings.
Ensure the user isn't still assigned to the Employee administrator role.
There may be other roles you want to unassign them from.
Once you're happy with their permissions, if you're trying to terminate their profile, you can do this now.
📎NOTE: If they were the original main admin, you can terminate their profile, but you can't delete them.