Control Panel Display Settings

I have two monitors - I use one primarily.

My normal setup in Display Settings is "Show Desktop only on 1" - this works fine.

If I switch to "Extend These Displays" my primary monitor desktop moves over to the second monitor and my main monitor shows the desktop background image with no icons (display 2).

How do I get the opposite to happen? When I switch from "Show Desktop Only on 1" to "Extend These Displays" I want my normal desktop to stay on monitor one and just the background to be extended onto monitor two.

Any thoughts?

Setup - Monitor 1 is a Dell U3011 via DVI - Monitor 2 is a projector via USB.

Background - this function worked normally until I changed primary monitors.

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