Wheelchairs are used by people for whom walking is difficult or impossible due to illness, injury, or disability.
They come in a wide variety of formats to meet the specific needs of their users.

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