How to use a main site wp-admin url for all sub-sites

Hi there.

Is there a way we can use a default url like /wp-admin for all sub-sites, instead of sub-site1/wp-admin and sub-site2/wp-admin?

All sign-ups and logins would be made always on the main site: cloudstore.pt/backend for example.

Any ideas? Thanks for your help. :slight_smile: