Suppress Hero on Pages Without Featured Image

@replace {{element_id}}

add_filter( 'generate_header_element_display', function( $display, $element_id ) {
   
   if ( {{element_id}} === $element_id ) {

      if ( ! has_post_thumbnail() )
         $display = false;

   }

   return $display;
   
}, 10, 2 );

Source