This is my first post so I'm hopeful I can explain my situation well. If it can't be solved, that's life.

My setup is as follows on a GeForce 960 video card:

2 24" monitors connected via DVI identified as monitors "2" and "3"
1 television connected via HDMI identified as monitor "1"

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I'm aware that the ports that you use for each monitor determines how Windows identifies them (I believe all of my problems would be solved if Windows allowed you to change these numbers).

When you hit the shortcut win+p, it brings up the quick display switcher.

Selecting 'PC screen only' will cause the desktop to switch to display 1, the television. Even if a monitor is set as my "main display" choosing this shortcut chooses a new set of display options that makes the HDMI connected TV the main display and turns off the other displays.

Selecting '2nd screen only' will turn on the monitors (display 2 and 3). With some fiddling inside the nVidia control panel I believe I've gotten it to turn on just display 2.

The problem is, when I hit 'Extend' it turns on display 1, the television, and one other display. I can't change this behavior, display 1 seems to always be included when you select 'Extend'. I'd like for 'Extend' to turn on the two monitors, displays 2 and 3. Ideally I'd like for 'PC Screen Only' to turn on just a single monitor, but I can live with having to choose 'Second Screen' to do that.