Hi,
I should have removed all my modifications, the code is the default one.
To be sure, you can still install our latest version over your current install, it will override all the code files.
If you just assign all the "Mean Well" products to the "wyszukaj-wszystkie" category, so they will all be displayed in the menu:
www.shemeck.pl/produkty/category/265-wyszukaj-wszystkie
And the filters will allow to filter them by type / voltage.
For the css you can add this code too:
#hikashop_category_information_menu_132 .hikashop_submodules { display:none; }
And regarding the filter message on bottom of page, this is potentially linked to the issue of the module inside a menu.
If you look at a product listing page using the default menu, do you have such message ?