External screen connects automatically?

I own a Surface Book and a surfacedock.

The Surfacedock is connected to a miniDisplay to HDMI cable, which is connected to my external screen.

Now the problem:

Whenever I want to load my laptop, I have to do it over the dock. And then he always connects to the external screen. Sometimes I do not want that. But it happens anyway. And even if I click on "project" on "PC screen only", it connects automatically after 2 seconds again.

How can I change this?

Times with FN key + $ monitor - while the Surface is in the dock to specify whether it displays clone, or 1 or 2?
Maybe he will remember that then?
Otherwise, I would say it's Windows, and Windows is proud to volunteer and show up on as many devices as possible:-)

Okay I've not found the key combination unfortunately but I've tried it now without dock, and then the attitude remains. So I guess that the dock sends this "impulse" in 2 seconds…: / And I can't really change anything about the programming from the dock, I think.

No, the dock has a kind of firmware and you can't change anything, only the manufacturer. But I hope you have come a little closer to solving your problem.