Images are automatically loaded

Hello,
I am using the metabox to upload multiple images. When I click to new post, it automatically is using the images of the ‘Media’ no I have chosen.
Every new post it loads all images of ‘Media’.
Have any setting should I do so that it does not automatically load the images?

add_filter( 'rwmb_meta_boxes', 'sizy_post_metaboxes' );
function sizy_post_metaboxes( $meta_boxes ) {
  global $text_domain;
  $prefix = 'sz_post_';
  $meta_boxes[] = array(
    'title'  => __( 'Informações', $text_domain ),
    'post_types'  => 'post',
    'priority' => 'high',
    'fields' => array(
      array(
        'id' => $prefix . 'local',
        'type' => 'text',
        'name' => __( 'Local do evento', $text_domain )
      ),
      array(
        'id' => $prefix . 'photo',
        'name' => __( 'Imagens', $text_domain ),
        'type' => 'image_upload',
        'force_delete'     => false
      ),
    )
  );
  return $meta_boxes;
}

https://wordpress.org/plugins/meta-box/