To modify woocommerce orders per page

     /**
     * Modify number of orders displayed per page in My Account
     *
     * @param array $args Query arguments for fetching orders.
     * @return array Modified query arguments.
     */
    function modify_order_per_page( $args ) {
        $args['posts_per_page'] = 4; // Change 10 to the desired number of orders per page.
        return $args;
    }
   add_filter( 'woocommerce_my_account_my_orders_query', 'modify_order_per_page', 10, 1 );