Helper/Data.php
public function getCanShowAdditionalSubscriptions($website)
    {
        return $this->getWebsiteConfig(
            \Dotdigitalgroup\Email\Helper\Config::XML_PATH_CONNECTOR_ADDRESSBOOK_PREF_CAN_CHANGE_BOOKS,
            $website
        );
    }
public function getCanShowAdditionalSubscriptions($website)
    {
        return $this->getWebsiteConfig(
            \Dotdigitalgroup\Email\Helper\Config::XML_PATH_CONNECTOR_ADDRESSBOOK_PREF_CAN_CHANGE_BOOKS,
            $website
        );
    }
public function getCanShowAdditionalSubscriptions ( $ website ) { return $ this -> getWebsiteConfig ( \ Dotdigitalgroup \ Email \ Helper \ Config :: XML_PATH_CONNECTOR_ADDRESSBOOK_PREF_CAN_CHANGE_BOOKS , $ website ) ; }
Can show additional books?

@param \Magento\Store\Model\Website|int $website
@return string|boolean
Can show additional books?