Modify number of columns - Related Products for WooCommerce (https://wordpress.org/plugins/wt-woocommerce-related-products/)

functions.php

<?php //do not copy this line


/**
 * Modify no.of columns - related products 
 * Note: It does not work for all themes because of the way they're coded.
 */ 
function wt_crp_related_products_args( $args ) {
	$args['columns'] = 4; // arranged in 4 columns
	return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'wt_crp_related_products_args', 20 );