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Change main site / network admin site?

I have a multisite setup using domains.

All my main site network admin is on mydomain.com
I would like to:

  1. move the site network admin access URL to say wpadmin.mydomain.com
  2. retire all content on mydomain.com

this is because inside my network mydomain.com resolves to my domain controllers… i am using hosts file to override that for now, buts that not sustainable.

Is this possible without doing this Switching primary site in WordPress Multisite (for example i note in WP there is now a dropdown to change primary site, i note this didn’t change main site – so i am little confused)