Added an option to change number of subcategories per row in grid view. However, if you cannot upgrade, contributor Michael Dekker built a free module to upgrade SwiftMailer for PrestaShop 18.104.22.168-22.214.171.124. Thank you Michael! Arranged in three columns, banners allow you to show your product categories and discounts for them on hover. Possibility to change position of menu(left/right/center). Megamenu module.