Everytime you update your WordPress MU site network it displays a welcome panel showing all new functions and updates to all your users. If you like you can easily hide it from all your subsite owners.
You may use the following action in your site’s plugin, or if you need this in single site then add this to your theme’s function.php file:
add_action( ‘load-index.php’, ‘fb_hide_welcome_panel_for_multisite’ );
function fb_hide_welcome_panel_for_multisite() {
if ( ! is_multisite() ) // don’t check, if you will use this on single install of WP
return;
if ( 2 === (int) get_user_meta( get_current_user_id(), ‘show_welcome_panel’, TRUE ) )
update_user_meta( get_current_user_id(), ‘show_welcome_panel’, 0 );
}
For multisite installations, Hide Welcome Panel for Multisite plugin is the best and easy option for hiding welcome panel all over your WP multisite network. It Prevent all users from seeing welcome panel on newly registered sites or after wp-updates.
Remember this plugin only applies to multisite networks and after installation it must be network activated