This plugin let you control the branding of the main site and all sub-sites in a network of websites powered by WordPress Multisite.
You can create a global template with branding and menu customization that all sub-sites in the network will be using. Or you can allow each sub-site in the network to create their own branding and customize their menus for the Editor role. You also have full control over all User Roles and Capabilities.
Replace the WordPress logo from the log-in screen and dashboard with your own identity or even your client’s. Add custom dashboard metabox viewable only to Editors or all users with your own welcome message or help.