I'm running Pro 14 on windows 7 with a QuadroK5200. Unlike 13, I do not see the choice of displays under the preview preferences. Additionally, you can see in the middle picture that I have external monitor initialized. Quadro drivers are updated. This runs fine in 13
.
Interesting, with my AMD R9 390X I have the selection. I will check if that same is true what you see for my Quadro K4200. What driver do you have installed? Oh, I see win7 - I am now on Win10.
After noticing this problem, I just updated to the latest driver on their site. All is well in 13, just nothing happens when clicking on external preview button plus the choices of displays are nonexistent.
Thank you Nick, what threw me off is that it is working properly in 13.