Hi sonamanish,
If you want to disable responsive you can remove or comment this code in pb.php (wp-content\plugins\ig-pagebuilder\core\pb.php)
$assets['ig-pb-frontend-responsive-css'] = array(
'src' => IG_Pb_Helper_Functions::path( 'assets/innogears' ) . '/css/front_end_responsive.css',
'ver' => '1.0.0',
);
InnoGears Support Team.