The setting of the number of columns of the listing is not taken into account in frontend shop. ("Theme configuration > Tab "Layout options" > Tab "Content" > Field Category listing > Columns desktop / tablet / phone viewport")
Reason / Solution
With ThemeWare, the number of columns of the listing can be customized to your individual needs.
This configuration can only be applied for categories assigned to the product layout "Only important information". The product layout of a category can be configurated under "Article > Category > Product layout".
Please pay attention to the support texts (blue question mark) next to the configuration field.