It seems that it SHOULD work only for the 2D mirror but that’s not the case. It also crops the image sent to the headset. Some say this might be a bug, but for us it’s a useful one.
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(You can corroborate this yourself by peeking under your HMD into the desktop screen)
Not an expert in VR at all, but it seems like the scene that the app renders is around 50% wider and taller than what we see on our HMD screens, this makes sense to some extent as VR relies on reprojection and the device will keep the 90hz while rotating your head by projecting the scene provided by the app, so this extra buffer can help the HMD project on rotation.
I think sudden movements are rare…
Edit: actually I’m not sure if this is reducing FOV at all for me, it looks like it’s avoiding the game to render some pixels that are not displayed in my FOV anyways (quest 2 via oculus link, no steamvr)
Edit 2: i can confirm that this is not reducing fov while looking straight for me, if i compare the fov on my oculus with what’s being shown on screen, the 2d screen is rendering a much wider FOV than my oculus when I don’t modify the FOV on the oculus, reducing the FOV makes it so the FOV on …
I found two older threads that go more deeply into this: