Edit: index.php

<?php
/**
 * Multisite administration panel.
 *
 * @package WordPress
 * @subpackage Multisite
 * @since 3.0.0
 */

/** Load WordPress Administration Bootstrap */
require_once __DIR__ . '/admin.php';

/** Load WordPress dashboard API */
require_once ABSPATH . 'wp-admin/includes/dashboard.php';

if ( ! current_user_can( 'manage_network' ) ) {
	wp_die( __( 'Sorry, you are not allowed to access this page.' ), 403 );
}

// Used in the HTML title tag.
$title       = __( 'Dashboard' );
$parent_file = 'index.php';

$overview  = '<p>' . __( 'Welcome to your Network Admin. This area of the Administration Screens is used for managing all aspects of your Multisite Network.' ) . '</p>';
$overview .= '<p>' . __( 'From here you can:' ) . '</p>';
$overview .= '<ul><li>' . __( 'Add and manage sites or users' ) . '</li>';
$overview .= '<li>' . __( 'Install and activate themes or plugins' ) . '</li>';
$overview .= '<li>' . __( 'Update your network' ) . '</li>';
$overview .= '<li>' . __( 'Modify global network settings' ) . '</li></ul>';

get_current_screen()->add_help_tab(
	array(
		'id'      => 'overview',
		'title'   => __( 'Overview' ),
		'content' => $overview,
	)
);

$quick_tasks  = '<p>' . __( 'The Right Now widget on this screen provides current user and site counts on your network.' ) . '</p>';
$quick_tasks .= '<ul><li>' . __( 'To add a new user, <strong>click Create a New User</strong>.' ) . '</li>';
$quick_tasks .= '<li>' . __( 'To add a new site, <strong>click Create a New Site</strong>.' ) . '</li></ul>';
$quick_tasks .= '<p>' . __( 'To search for a user or site, use the search boxes.' ) . '</p>';
$quick_tasks .= '<ul><li>' . __( 'To search for a user, <strong>enter an email address or username</strong>. Use a wildcard to search for a partial username, such as user&#42;.' ) . '</li>';
$quick_tasks .= '<li>' . __( 'To search for a site, <strong>enter the path or domain</strong>.' ) . '</li></ul>';

get_current_screen()->add_help_tab(
	array(
		'id'      => 'quick-tasks',
		'title'   => __( 'Quick Tasks' ),
		'content' => $quick_tasks,
	)
);

get_current_screen()->set_help_sidebar(
	'<p><strong>' . __( 'For more information:' ) . '</strong></p>' .
	'<p>' . __( '<a href="https://developer.wordpress.org/advanced-administration/multisite/admin/">Documentation on the Network Admin</a>' ) . '</p>' .
	'<p>' . __( '<a href="https://wordpress.org/support/forum/multisite/">Support forums</a>' ) . '</p>'
);

wp_dashboard_setup();

wp_enqueue_script( 'dashboard' );
wp_enqueue_script( 'plugin-install' );
add_thickbox();

require_once ABSPATH . 'wp-admin/admin-header.php';

<?php wp_dashboard(); ?>

</div>

<?php
wp_print_community_events_templates();
require_once ABSPATH . 'wp-admin/admin-footer.php';

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