Here is the PHP Code you can copy and paste to remove the Bricks Builder header using a PHP action hook – specifically render_header.

// remove the Bricks Header
add_action('get_header', 'c_remove_bricks_header');
function c_remove_bricks_header() {
  if( is_singular(array('wffn_optin', 'wffn_oty', 'wffn_landing'))) {
    remove_action( 'render_header', [Bricks\Theme::instance()->frontend, 'render_header'] );
  }
}
Code language: PHP (php)

In the above code, I am removing the Bricks Header from the Post Types that I use for my Sales Funnels built using the FunnelKit plugin.

You just need to add your own PHP Conditions on line 4.

If you are looking for something a bit simpler, I would recommend checking out the below Blog Post where I show you how to remove the Bricks Header and Footer using the Bricks UI on a per-post basis.

RELATED: Remove the Header and Footer in Bricks Builder (The Correct Way)