Decor Walther: By Collection

You do not have a link list with a handle set to decor-walther-by-collection, or you do and it's empty. Go ahead and create a link list called Decor Walther: By Collection 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 decor-walther-by-collection.