Is it possible to use Paypal express checkout without signing in even if the user has a Paypal account present? 

We have noticed that some folks forget their credentials and don't want to login to Paypal, thus causing us to lose their donation. The Account optional setting seems to still require users, who have a Paypal account linked to the provided email, to sign in even if they would like to pay from the checkout page.

Is there a way to avoid this?

Thanks!