Disable Site Health

// Remove Tools Submenu Item for Site Health.

add_action( 'admin_menu', function () {

	remove_submenu_page( 'tools.php', 'site-health.php' );

} );

// Prevent direct access to the Site Health page.

add_action( 'current_screen', function () {

	$screen = get_current_screen();

	if ( 'site-health' === $screen->id ) {

		wp_safe_redirect( admin_url() );

		exit;

	}

} );

// Disable the Site Health Dashboard Widget.

add_action( 'wp_dashboard_setup', function () {

	global $wp_meta_boxes;

	if ( isset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_site_health'] ) ) {

		unset( $wp_meta_boxes['dashboard']['normal']['core']['dashboard_site_health'] );

	}

} );