De register custom post type in The7 theme

!Update 2018: In latest version of The7, you can disbale it from The7 > My The7 menu.

You may not be using all the post types in The7 theme. You can disable the unwanted one, For eg to disable testionails, try this in your child theme functions.php.

class Presscore_Inc_Testimonials_Post_Type {
 public static function register() {
 return;
 }
}

Refer to ../THEME-NAME/inc/post-types.php for other post type class.

You can also use plugins like Adminize to hide unwanted items.