I downloaded Display Fusion years ago so I found out i could do that the other day, dont remember if I had to pay for the program or not, dont think so, but now all i have to do is Press the win key and < to make display 1 my main or press the win key and > to make display 2 my primary. works very well amd I dont have to go into resolutions and do it manually anymore. If you find the program you will figure it out, there is also one called Ultramon which will probably do it as well