Recursive Categories module for OXID eShop 6.x. For lower OXID eShop Versions view the original git by Christian Neumann
This module changes the default OXID eShop behaviour to list products of a chosen category including the products in its subcategories.
composer require proudcommerce/dk_recursivecats
The module is based on ideas posted in the OXID Community Forum (german): http://forum.oxid-esales.com/showthread.php?t=16310