You do not have a link list with a handle set to 2019-dodge-6-7l-cummins, or you do and it's empty. Go ahead and create a link list called 2019+ Dodge 6.7L Cummins 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 2019-dodge-6-7l-cummins.