How to change Number of Upsell products displayed on Single Product Page in Woocommerce

functions.php

<?php

    //Changing Number of Upsell products display on Single Product page -- By Darshan Gada
    add_filter( 'woocommerce_output_related_products_args', 'wc_change_number_related_products' );

    function wc_change_number_related_products( $args ) {
        $args['posts_per_page'] = 1;
        $args['columns'] = 4; //change number of upsells here
        return $args;
    }

?>