On this page you will find the SENSUS- STUDIO collections (categories).
I.e.: Landscape, Dance, all art by Mother Nature Photography, all art by Exceptional Art etc.
You do not have a link list with a handle set to sensus-gallery, or you do and it's empty. Go ahead and create a link list called COLLECTIONS 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 sensus-gallery.