Show Product Search in Header

//Show Product Search in Header
function new_nav_menu_items($items, $args) {
    
    $my_product_search = get_product_search_form( $echo );
    
    if($args->theme_location == 'main_navigation'){
       $items = $items . $my_product_search;
    }

    return $items;
}
add_filter('wp_nav_menu_items', 'new_nav_menu_items', 10, 2);