Never mind. Found this article: https://community.tp-link.com/en/smart-home/forum/topic/681752%C2%A0 in which the problem is described and a workaround is offered.

I want to be able to choose whether I want to start a videocall when someone presses my D235 smart doorbell or not. In the Tapo app the videocall option is activated automatically and can not be...