The VR mode is mostly aimed at being used with Google Cardboard style VR viewers on Android. However it is possible to use it on a computer too.
You activate side-by-side VR mode in the Custom Settings.
You could for example use it with your FPV goggles connected via HDMI. You will probably need to adjust the resolution of the simulation to fit the goggles.
Note that it is not a complete plug-and play VR solution, it is mostly for those who like to tinker and experiment.
(You can find more general tips in the user manual, get back to me with specifics on how you intend to use it and I might be able to give more specific information).