As a workaround, I was able to do this via the terminal, so this could be scripted to happen on start:
$ xrandr --listmonitors $ xrandr --output HDMI1 --rotate left
As a workaround, I was able to do this via the terminal, so this could be scripted to happen on start:
$ xrandr --listmonitors
$ xrandr --output HDMI1 --rotate left