Show products in 1 listing divided by catname

You can't do that with the options in HikaShop.
Well, you could do something somewhat static to achieve that by creating one products listing module per category and then using the loadposition plugin of joomla to load them one after the other in a joomla article.

Otherwise, you would have to edit one of the view files of the view category in order to load the products of each category and display them directly in it. But that's really not easy to do as you need a lot of code to do that.