display-choose-option-placeholder-dropdown-option-and-clear-selection-button

<?php
/**
 * Plugin Name: WooCommerce Composite Products
 * Plugin URI: https://woocommerce.com/products/composite-products/
 * Description: Use this snippet to display the "Choose an option" placeholder dropdown option and the "Clear Selection" button. * Version: 1.0
 * Author: WooCommerce
 * Author URI: https://woocommerce.com/
 * Developer: Manos Psychogyiopoulos
 *
 * Requires at least: 3.8
 * Tested up to: 5.3
 *
 * Copyright: © 2021 Automattic.
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */
 
 add_filter( 'woocommerce_composite_component_show_placeholder_option', '__return_true' );