Little help with sorting in 'contentarray' particle

[ghost]

Hi,

I have quite unusual issue. I wanted to use a particle called contentarray. It is really great, but it has some inaccuracies. I want to display the feature articles, but they come mostly from several categories (let's say A, B and C). What can I do if I want to have articles from category A always on top?
When I add new article to B or C and I mark it as a feature, then Joomla automatically push everything from top to bottom. Why I want to do it? The main reason is that the articles from the category B and C are added frequently, so if someone comes to my website very rarely, he might never notice that article from A category was ever published at all!
Of course, I can just add another contentarray particle, but it will be the third on the home page, whilst my website has a lot of articles and I want to ensure my database the best optimization.
If I can't do it that way, does anyone recommend any other solution?
Where can I find the files response for this module?
For now, I only found those:

administrator/components/com_gantry5/templates/forms/fields/joomla/categories.html.twig
libraries/gantry5/classes/Gantry/Joomla/Content/Content.php
libraries/gantry5/classes/Gantry/Joomla/Content/ContentFinder.php
libraries/gantry5/classes/Gantry/Joomla/Category/Category.php
libraries/gantry5/classes/Gantry/Joomla/Category/CategoryFinder.php
libraries/gantry5/classes/Gantry/Framework/Platform.php

Are there any more? (Especially, I'm looking for .twig and .yaml files)

Thank you in advance very much!

[mahagr]

There's also this: http://docs.gantry.org/gantry5/advanced/content-in-particles

Advanced sorting doesn't work right now; you can only sort by a single field.

[mahagr]

Closing due to inactivity.