[Theming Snippets] Change number of related products output

wc-change-number-of-related-products.php

/**
 * Change number of related products output
 */ 
function woo_related_products_limit() {
    global $product;

    $args['posts_per_page'] = 4; // Only show 4 related products.
    $args['columns'] = 2; // arranged in 2 columns.

    return $args;
}
add_filter( 'woocommerce_output_related_products_args', 'woo_related_products_limit', 20 );