pb-set-bundle-sells-layout-to-grid

 <?php
/**
 * Plugin Name: WooCommerce Product Bundles.
 * Plugin URI: https://woocommerce.com/products/product-bundles/
 * Description: Use this snippet to change the bundle sells layout to grid
 * Version: 1.0
 * Author: WooCommerce
 * Author URI: https://woocommerce.com/
 * Developer: Jason Kytros
 *
 * Requires at least: 2.6.0
 * Tested up to: 5.7
 *
 * Copyright: © 2021 Automattic.
 * License: GNU General Public License v3.0
 * License URI: http://www.gnu.org/licenses/gpl-3.0.html
 */

add_filter( 'wc_pb_bundle_sells_dummy_bundle', 'wc_sw_bs_change_layout' );

function wc_sw_bs_change_layout( $bundle ) {
	$bundle->set_layout( 'grid' );

	return $bundle;
}