builder-get-current-layout-name

function example_get_builder_layout_name( $layout_id, $layout_settings ) { 
    $layout_name = $layout_settings['layouts'][$layout_id]['description'];
    // Do as you wish with these details.
}
add_action( 'builder_layout_engine_identified_layout', 'example_get_builder_layout_name', 0, 4 );