The following bit of code will change the number of related products that are displayed on a Woocommerce single product page. Add this to your functions.php file.

/* Woocommerce change the number of related products on the single product page*/
function woo_related_products_limit() {
global $product;
$args['posts_per_page'] = 3;
return $args;
add_filter( 'woocommerce_output_related_products_args', 'jk_related_products_args' );
function jk_related_products_args( $args ) {
$args['posts_per_page'] = 3; // 3 related products
$args['columns'] = 3; // arranged in 3 columns
return $args;

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