Remove default Wordpress admin dashboard widgets

functions.php

/**
 *  Remove Unwanted Dashboard Widget
 */
function remove_dashboard_meta()
{
	// remove_meta_box( 'dashboard_activity', 'dashboard', 'normal' ); // Activity
	remove_meta_box('dashboard_primary', 'dashboard', 'normal'); // WordPress News
	remove_meta_box('dashboard_quick_press', 'dashboard', 'side'); // Quick Draft
	// remove_meta_box( 'dashboard_right_now', 'dashboard', 'normal' ); // At a Glance
	remove_meta_box('dashboard_site_health', 'dashboard', 'normal'); // Site Health
}
add_action('admin_init', 'remove_dashboard_meta');

/**
 * Remove Site Health Sub Menu Item
 */
add_action('admin_menu', 'remove_site_health_menu');
function remove_site_health_menu()
{
	remove_submenu_page('tools.php', 'site-health.php');
}