bhyve Adjusting or Preventing Screen height from shrinking when running bhyve VMs

I usually expand my Terminal window to take the full height of the screen. After running a bhyve VM (e.g. OpenBSD) - running and after shutting down the VM - the usuable height of the Terminal screen/window became shortened. How can I prevent this?

Note: There is no fbuf in my bhyve option and I'm NOT talking about the VNC accessible area (which is set like "-s 29,fbuf,tcp=[::]:5900,w=800,h=600"). I'm running a pure console-based VM.