News Section

Hi @frvidrine,

Yes. You need to open this file in your theme :
https://github.com/FameThemes/onepress/blob/master/section-parts/section-news.php

then add 'cat' => 4 after L39, and replace 4 by your category ID.

You can read more here : https://codex.wordpress.org/Class_Reference/WP_Query#Category_Parameters

P/s : I recommend you do it via child theme.