Enable Eyefinity during games only

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My situation is i have a 15.6 inch laptop with a screen resolution of 1366x768. Earlier i hooked up my old HP vf15 (its a 4:3 aspect ratio) which has a resolution of 1024x768. I tried setting up eyefinity, but it streched out my laptop display and it looked normal on the other monitor (this is on the desktop screen only, where you can see windows and stuff). I wanted to know if there was a way to enable eyefinity during games only. Or if theres anyway to prevent my laptops screen from stretching. Thanks in advance!