MainWP supports customized /wp-admin/ installations. If your child sites have custom /wp-admin/ path, sites will connect to your Dashboard.
By default, MainWP Dashboard will try to reach http://url.com/wp-admin/admin-ajax.php; if it fails, it will retry with http://url.com.
Changing WP Admin is allowed only on the Child Site. Changing it on the dashboard site may cause various issues.
MainWP supports renamed wp-login.php installations. If your child sites have a custom login URL, sites will connect to your Dashboard.
Custom Login URL is allowed on the Child Sites and Dashboard site.