Remove sidebar on post format or post category

Hi ??

I am trying to modify/create a post template in a child theme.
For only one of my post category, I would like the title and the sidebar to not be displayed.

I tried removing the <?php get_sidebar(); ?> from the category.php and the single-gallery.php files.

Ideally, I’d like the gallery post format to simply not display any sidebar or title for the category “cas agence”

Here is a link to my test page

Thank you in advance for your help, much appreciated!