Category page layout like Blog

Hi:
In any of my category pages, it shows 10 total posts in 3 column, but I would like to increase the number of post an only two columns. Any idea?

Actualy I’ve this code in my functions.php (in child theme):

add_filter(‘avf_blog_style’,’avia_change_category_blog_layout’, 10, 2);
function avia_change_category_blog_layout($layout, $context){
if($context == ‘archive’) $layout = ‘blog-grid’;
return $layout;
}
add_filter(‘avf_blog_style’,’avia_change_tag_blog_layout’, 10, 2);
function avia_change_tag_blog_layout($layout, $context){
if($context == ‘tag’) $layout = ‘blog-grid’;
return $layout;
}

Regards.