Canvas does not render when outside of OVR CameraRig 'reach'

I have a big tutorial image (it's big, because otherwise text tip on it look ugly) I tried repositioning it in different manners to achieve best quality and at some point it just does not render if the canvas is outside of that OVR CameraRig 'FOV box' or whatever that thing is. How do I change it?

Update
In Unity's preview all 3 cameras show the canvas just fine, however, when I build it and launch on Oculus Go something black covers the canvas and I have to either look up, down, left or right for a part of canvas to render.