WordPress Multisite settings are managed at two levels: network-wide (Super Admin) and per-site (Site Admin). Understanding which settings live where is key to managing a multisite installation.

Network Settings (Settings → Network Settings)

These apply across all sites in the network:

Operational Settings

• Network Title — displayed in the admin bar and network admin
• Network Admin Email — receives network-level notifications (new site registrations, upgrades)

Registration Settings

• Allow new registrations — controls whether visitors can register accounts and/or create new sites
  • Disabled (default)
  • User accounts only
  • User accounts and new sites
• Add New Users — allows individual site admins to add new users (off by default; users must already exist on the network)
• Limited Email Registrations — restrict signups to specific email domains
• Banned Email Domains — block registrations from specific domains

New Site Settings

• Disabled (default)
• User accounts only
• User accounts and new sites

Upload Settings

• Disabled (default)
• User accounts only
• User accounts and new sites

Menu Settings

• Welcome Email — template sent to new site admins
• Welcome User Email — template sent to newly registered users
• First Post/Page/Comment — default content created on every new site

Per-Site Settings (Network Admin → Sites → Edit)

Super Admins can override settings on individual sites:

• Site upload space — disk quota per site (default: 100 MB)
• Upload file types — allowed MIME types across the network
• Max upload file size — per-file limit (default: 1500 KB)

wp-config.php Constants

Key constants that affect multisite behavior:

WP-CLI

# List network settings
wp network meta list 1

# Get a specific network option
wp site option get registration

# Update network settings
wp site option update registration 'user'

# Per-site settings
wp option get blogname --url=site2.example.com

Storage

• Enable administration menus — toggle Plugins menu visibility for site admins (disabled by default for security)

Related

• Info tab — domain, path, registered date, last updated, attributes (public, archived, spam, deleted, mature)
• Users tab — manage site-specific users and roles
• Themes tab — enable/disable specific themes for this site
• Settings tab — raw wp_options editor for the site (advanced)