Piwik\Widget\WidgetConfig::disable PHP Method

    public function disable()
    {
        $this->setIsEnabled(false);
    }

 public static function configure(WidgetConfig $config)
 {
     $config->setCategoryId('General_Visitors');
     $config->setName('Live_VisitorProfile');
     $config->setOrder(25);
     if (Piwik::isUserIsAnonymous()) {
         $config->disable();
     }
 }