In a multisite, super admins are listed together with ordinary admins in the child site user list page. For example, say the main site is cooldomain.com and one of the child site is subdomain.cooldomain.com.
Super admins appear in the user list page in subdomain.cooldomain.com , example here: subdomain.cooldomain.com/wp-admin/users.php
Some super admins may not want this for privacy and security. This plugin removes the super admin from the child site user list page.