How to enable true full screen?

In all modes I always end up with a pretty big “bezel” of black space, even if I use the maximize setting, reducing the effective FOV. How do I get true full screen? Would be great to keep the smooth follow too. I don’t see any additional settings in these modes:

0dof single window w/ 3D

3dof multi-window 2D

3dof multi window 3D