running sneakers, leather sneakers, low top sneakers, high top sneakers, knit sneakers, skate sneakers all designed by Sensus Studio

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