The configuration in "Sales -> Payment Services -> Payment Template" is not related to the Hosted Tokenization IFrame for credit cards (HTP / Flex Checkout).

It applies to payment methods that would usually cause a redirection to an external payment page (like Paypal). See also the official documentation, section "Configuration - Magento".

Payment Template configuration

To enable or disable the IFrame for credit cards (HTP / Flex Checkout), go to "Sales -> Payment Methods -> Ingenico ePayments Cc -> Enable inline payment for these card types".

If you want to change the styling of the IFrame for credit cards (HTP / Flex Checkout), please see this article.