Change Number of Items on WooCommerce Orders Page

To change the number of items on the WooCommerce orders page (on the front end), use the following code where X is the maximum number of items to display (functions.php):

function custom_my_account_orders( $args ) {
    $args['posts_per_page'] = X;
    return $args;
}
add_filter( 'woocommerce_my_account_my_orders_query', 'custom_my_account_orders', 10, 1 );

More on managing and handling orders in WooCommerce sites in the post Managing orders in WooCommerce.