Scope of support:
We are unable to provide support for customizations under our Support Policy. If you need to customize a snippet or extend its functionality, we recommend working with a Woo Agency Partner or a WooCommerce developer on Codeable.

Add code to your child theme’s functions.php file or via a plugin that allows custom functions to be added, such as the Code snippets plugin. Avoid adding custom code directly to your parent theme’s functions.php file as this will be wiped entirely when you update the theme.

Please note that it does not work for all themes because of the way they’re coded.

/**
 * Change number of related products output
 */ 
function woo_related_products_limit() {
  global $product;
	
	$args['posts_per_page'] = 6;
	return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'jk_related_products_args', 20 );
  function jk_related_products_args( $args ) {
	$args['posts_per_page'] = 4; // 4 related products
	$args['columns'] = 2; // arranged in 2 columns
	return $args;
}