alright – so I get now what you mean … I assumed you were talking about the "default styling", i.e. unbranded Version of that button. However, what you are mentioning and want to change is behavior that's being caused by Shopify based on a number of aspects. You can read a lot about it on the Dynamic checkout buttons help-page:
On the Brave-browser I can trigger different behaviors of the button depending on whether I browse to it using "shields up" or not.
I hope this helps!
PS: Since you posted in the German-language part of the board, I wondered if that was a purposeful decision or happened by accident.