I finally found the correct PHP file and updated with a multisite filter line.
File Location: /plugins/better-wp-security/core/modules/hide-backend/class-itsec-hide-backend.php
Add this to line 50:
add_filter( ‘network_site_url’, array( $this, ‘filter_login_url’ ), 10, 2 );
Plugin Developer, Can you please update the code for the next version release.
Thank you,
