Change WordPress user roles and capabilities › Forums › How to or FAQ › Remove superadmin role from the “change role to” menu in user listing › Reply To: Remove superadmin role from the “change role to” menu in user listing
Thank you for details. One more thing to check, just to be sure:
Login as superadmin, go to “Network Admin -> Users” and check if your test user with ‘administrator’ role does not have ‘Superadmin’ privilege granted there.
It could be a reason why ‘Other roles access’ does not work for ‘Site admin (administrator)’ role.