function change_settings_position( $settings, $options ) {

    foreach ( $settings as $key => $setting ) {

        if ( $setting['section'] == 'main' ) {
            $settings[$key]['section'] = 'setup';
        }

    }

    return $settings;

}

add_filter( 'wpf_configure_settings', 'change_settings_position', 20, 2 );