Clarifications about the displaying of the sub category products [SOLVED]

-- HikaShop version -- : 3.2.2
-- Joomla version -- : 3.8.3

Hi to all,
I have been trying to several months to resolve this issue but withiìout result, I've been reading all posts in this forum with similar problems but I haven't found the solution. Probably i didn't understend somethings about the configurtion options.

My situation is simple, i have 3 level of category whit relative menus like this
_Food - - - Level 1
__Rice - - - Level 2
__Soy Souce - - - Level 2
__Sauces - - - Level 2
____Vinegar - - - Level 3
____Oil - - - Level 3
____Stock - - - Level 3
Every menu types is product listing, and if i click on the Sauces item i want to see all subcategory products (vinegars, oils and stocks products). To make this i set sub elemnt filter to "All sub elemnts" in Data display Options, but nothing change.
Now my 3th level product are associated only to the same level category and not to it's parent category.
I can see the subcategory prducts only if i manully add parent category to 3th level products, but this is not really a solution.
Why if I set the filter to "All sub elemnts" I don't see nothing ?
How the displaying of the sub category products exactly works ?
Where am I wrong?

Many thanks

Luca

Hi Nicolas,
sorry for the late response, your solution about use the "rebuild" button of the categories listing in the backend is the right one, after this all menus works.

I add [SOLVED] in the subject.

Many thanks

Luca