That’s a very impressive cockpit you are working with.
I don’t remember how you do it with Oculus, but if using the OpenXR runtime as you would for MSFS, in the bottom of the Mixed Reality Portal window, there is a right facing arrow that you can click on. When you float your mouse over it, the label will be Start preview. If using SteamVR as you would with DCS, on the menu in the upper left hand corner of the little window which pops up, click Display VR View. In both cases you can make the image full screen, although it will force either right or left dominance. For your purposes, will probably be better than the two eye look.
An Oculus user will need to chime in for that solution.