Bitrix how to display (sort) products on the catalog page by section sort index?

Question

1C-Bitrix

Hello! There is a website, on the page /catalog/ I display all the products. Products have different sections. How to initially sort products on the catalog page by section sorting index? So that first there are goods from the section whose sorting index is 1, then goods from the section whose sorting index is 2, and so on ... Is it possible?

Answer 1

I think it's possible.
In theory, it should work if you first pull out all the id sections sorted as you need and pass CIBlockElement::GetList to the filter, while specifying an empty array or null in sorting.