The “main site” of a network on a WordPress multisite environment is typically the first site (ID 1), and will be listed first in the Network Admin Sites screen.
The main site should be used for administrative purposes only: with a default theme activated, no content added, and access to the site restricted by Maintenance Mode.
All new sites added to a multisite network will initially exist as subdirectories of the main site’s domain. It can therefore be useful to have a custom domain assigned to the main site (ID 1) for branding purposes, such as
Last updated: October 30, 2022