WC Vendors Pro includes a basic shipping label with a picking slip for vendors to download and print. The shipping label template can be found in templates/dashboard/orders/shipping-label.php You can read how to override templates with this article.
The shipping label available for the vendors will open in a new tab to allow for easy printing. This is a standard HTML page which can be designed/modified as required.
This is a very simple template meant to allow a marketplace to style the shipping label as they require. There are several variables available to use within the template and are as follows:
$order $store_name $store_address1 $store_address2 $store_city $store_state $store_country $store_postcode $products_html
This will give you access to everything required for the order to design a shipping label as you’d like.