Tab issue

add_filter( 'rwmb_meta_boxes', 'your_prefix_register_meta_boxes' );
function your_prefix_register_meta_boxes( $meta_boxes ) {
    $meta_boxes[] = array (
        'title' => 'Listing Info',
        'id' => 'listing-info',
        'post_types' => array(
            0 => 'listing',
        ),
        'context' => 'normal',
        'priority' => 'high',
        'fields' => array(
            array (
                'id' => 'text_2',
                'type' => 'text',
                'name' => 'Text Field',
                'tab' => 'label-1',
            ),
        ),
        'tab_style' => 'default',
        'tab_wrapper' => true,
        'tabs' => array(
            'label-1' => array(
                'label' => 'Tab',
                'icon' => 'dashicons-admin-generic',
            ),
        ),
    );
    return $meta_boxes;
}