The product description in product boxes is a feature of Shopware and not of ThemeWare®. If you do not want to display this, you can simply select a listing layout without a product description (e.g. "Big image" or "Minimal content"). An additional configuration in ThemeWare® is therefore not necessary.
Product description in the product box
Listing layout type
Tip: For more information on Shopware CMS elements, take a look at the Shopware documentation.