Category list display & SEF urls

-- url of the page with the problem -- : atmospheredailleurs.jp-webmarketing.com/collections
-- HikaShop version -- : 2.6.4
-- Joomla version -- : 3.6.2

Hi,

On my main menu, i'm supposed to have :
HOME -> Collections -> Category_name
which displays all product from the category, and
HOME -> Collections
which displays all the categories, and JUST the categories.

On the menu link parameters, when i change the "sub element filter" setting to "direct sub-elements" in the "products options" tab and in the "categories options" tab , it still displays all products in the HOME -> Collections page, after the category listing.

Another issue : my shops behaviour is is defined to use canonical urls when it exists.
So, in each categories , i put "/collections/(category-name)".
Now if i get a product page from the HOME-> Collection page or from the HOME -> Collections->(category) page, i get the same url which is
/collections/(category-name)/product/(product-name) Its fine, now i just wander if its possible to remove the "product" string the same way i removed the "product" string.
I tried to put canonical urls in the products like " /collections/(category-name)/(product-name), but it dont works. I just get a 404 error