$options = new_cmb2_box( array(
      'id'  => '_ld_theme_option_metaboxes',
      'title'        => 'Theme Options',
      'object_types' => array('options-page'),
      'option_key'   => '_ld_theme_options',
      'parent_slug'  => 'options-general.php',
      'icon_url'     => 'dashicons-admin-settings'
));