How to display all products from a catalog on the 1C Bitrix catalog page?

Question

1C-Bitrix

Good evening, I ran into a problem: you need to display products from the catalog (catalog.element) on the catalog list page (catalog.list)
To make it clear, visually:
Catalog:
1. Roses
1.1 Red
1.2 Green
1.3 Blue
2. Tulips
2.1 White
2.2 Red
etc.

I did it through GetList, it displays all the products, but not with all the parameters that I need, I enter them into the arSelectFields array and get them successfully, however, only one category already falls into the list of products, for example, only roses - how to make sure that there are all goods with the desired parameters.

CIBlockSection::GetList(array("SORT"=>"ASC"),$arFilter,false, false, array(
              "IBLOCK_ID", 
              "ID", 
              "NAME", 
              "PROPERTY_CODE", 
              "CATALOG_PRICE_1", 
              "CATALOG_CURRENCY_1", 
              "PREVIEW_PICTURE", 
              "ITEM_MEASURE", 
              "DETAIL_PAGE_URL"));

+ I can't get product units (ITEM_MEASURE) - there is one in the request, but I don't get it. Is there any way to fix this too?