Using a secondary screen

I am currently working on a personal little VR game. I have dual monitors and would like to have the UE4 engine stay on my primary screen while having only the VR Preview show up in full screen on the secondary screen. Is this possible?

Did you manage to solve the problem? I would like to have the same thing

You can setup a render target and then use some of UE4’s Spectator Screen features to set the resolution etc of your VR preview. Then you can feed that render target to a new window:
https://api.unrealengine.com/INT/Platforms/VR/VRSpectatorScreen/index.html

Also, Unreal engine 4.20 has a new plugin called n-display that allows you to sync multiple computers + screens

https://docs.unrealengine.com/en-us/Engine/Rendering/Rendering-to-Multiple-Displays-with-nDisplay