Using Cinema Display

Kind and Intelligent People,
I have a MacBook that I use with a 23" Cinema Display when I am in my office. I want the Cinema Display to function as my 'desktop', and the MacBook display can be black for all I care. I do not want to 'mirror' the displays, because that makes the icons etc. proportionally larger - and what I want is small icons, with tons of space around them.
This morning I plugged the MacBook into the Cinema Display (or the other way around), while it was asleep. When I opened the MacBook, the C/D came to life as the desktop, and the MacBook display was black - perfect. At lunch I closed the MacBook, and the C/D went black - fine. After lunch I opened the MacBook, and it's display now was the desktop, and I could (had to) drag stuff to the C/D - not happy.
So my question is - is there any way to control the displays - beyond the side by side vs. mirror modes?
Thanking you in advance,
Phillip

Hi Laphil,
Try pressing F7 back and forth if that what you mean as alternative option beside system preference > display.
Good Luck.

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