Project Update: The Somnia Tarot decks are now shipping as of September 23rd! Thank you for bringing my project to life! - Nicolas

You do not have a link list with a handle set to order, or you do and it's empty. Go ahead and create a link list called Presale 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 order.