thanks Mike. I did already add the Title properly and nothing happened. It is not shown on Shopify.
Even if I set up the Postfinance payment method separately, if the system does not show the title on Shopify front end, it will not make a difference.
Customers will see a card symbol without any title of logo of Postfinance (it is not in Shopify per default like VISA or Mastercard)
So the question remains: why the title of the payment method is not showing on Shopify front end?