There's a dialog for setting up resolutions and relative position of the screens to each other. Attaching a screen means that it's automatically fired up with its default settings.
Each screen has the window bar, and clicking on icons there opens the respective website/app on that screen.
When closing the laptop with an attached screen, it merely disabled the display (instead of going to sleep completely) which was confusing the first time but actually makes sense and is how other devices handle the situation as well.
There's a dialog for setting up resolutions and relative position of the screens to each other. Attaching a screen means that it's automatically fired up with its default settings.
Each screen has the window bar, and clicking on icons there opens the respective website/app on that screen.
When closing the laptop with an attached screen, it merely disabled the display (instead of going to sleep completely) which was confusing the first time but actually makes sense and is how other devices handle the situation as well.