You do not have a link list with a handle set to whats-new, or you do and it's empty. Go ahead and create a link list called What's New 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 whats-new.
See all our latest launches - by collection - for Spring/Summer 2019 listed below.
If you'd prefer to scroll through our new designs product-by-product please Click Here