Fixed root category list independent from chosen category

-- url of the page with the problem -- : under development
-- HikaShop version -- : 4.6.2
-- Joomla version -- : 3.10.1
-- PHP version -- : 7.4.3

Hi,

I have to create a module which lists the main categories under root category (let's say cat level 1).
This listing of categories should not change (so remain the main categories) even if the user clicks on one of the items and the contained products or subcategories are listed in a main module on the page.
How can I prevent such a category listing module to be changed or rendered according to the selected category.
The purpose of this module is to be shown in the main menu under a 'webshop' menu item but it should always contain ONLY the main categories and should be independent from the selection of the user.

How can I set up such a category listing module?