catchbox free: full-width no-sidebar posts and category pages

Hi, I use your wonderful catchbox theme, the free version. I use the no-sidebar full-width option for my pages but the home-page. I would like to have the same for my posts and category archive page. I use a child theme and I managed to take the sidebar bar away, yet I am not able to have a full-width content area. How can I do? I search in the forum, but I have not found any information that fit my case. Here the link I am talking about (single post page) http://mbfm.be/wp/event/bsf-2016/?instance_id=12 (single post page) http://mbfm.be/wp/fr/ici-tout-est-symbole/ (category archive page) http://mbfm.be/wp/fr/category/evenements-passes/ Thank you in any case Lapo