You do not have a link list with a handle set to all-collections-swimwear-beach-clothes-accessories, or you do and it's empty. Go ahead and create a link list called All Collections: Swimwear, Beach Clothes, & Accessories on your Navigation page and populate that link list with links that point to collections, to see collections listed here. Make sure the link list also has a handle set to all-collections-swimwear-beach-clothes-accessories.