This free code enables you to change the order of your categories displayed using the WooCommerce Product Categories widget.
On your WooCommerce > Products > Categories admin page, you can change the order of categories on the front-end using drag and drop to sort them.
Using the following code in your child themes functions file, you can change the default order.
Tested using the Genesis Sample child theme by StudioPress with the Genesis WooCommerce Connect plugin.
You can learn more about this hook in wp-content > plugins > woocommerce > includes > widgets > class-wc-widget-product-categories.php
The hook used in this function enables you to filter the wp_list_categories arguments used to display your product categories in the WooCommerce Product Categories widget.
You could also use the wp_list_categories hook ( Untested ) like this :
add_filter('wp_list_categories','modify_wooc_product_categories_order');
function modify_wooc_product_categories_order($output) {
// Add your modified arguments here
return $output;
}