Switching presentation and editing screen?

I have a laptop with an external, bigger screen.
When the computer is docked, the external screen is my main screen (i.e.
the screen with the taskbar or screen 1), the laptop is the secondary
screen.

When I switch powerpoint to presentation mode, for some reason it
displays the slides fullscreen on the laptops built-in screen (i.e. the
secondary screen), while on the primary screen it still shows PPT in
editing mode. This is quite nice for *developing* a presentation, but
when I want to *show* the presentation, be it to someone in the
office, or if I attach a beamer to present, then I of course would
like to see the presentation on the external screen or beamer and
the editing window and speaker notes on the laptop's built-in
panel.

Can one somehow tell powerpoint to switch these two?

Michael