If I've understood correctly the offsets change what is "straight ahead" and that's what I'm trying to do.
In my usecase, I need a full screen outside view with yaw string for a cockpit simulator. X-Plane doesn't support this, so I've created a transparent 2D panel with yaw string as generic needle instrument. But in 2D panel view horizon is too high in neutral flying position so I'd like to change vertical offset to move horizon to center of visual.
I understand this is marginal use case. But on the other hand, why should setting the offsets to anything but zero hide the 2D panel? I don't see any reason for that.