That is not true. Mac OS absolutely has the ability to do this, but it has to be done on the command line because the gui is shallow. Sometimes I would like t

That is not true. Mac OS absolutely has the ability to do this, but it has to be done on the command line because the gui is shallow. Sometimes I would like to disable the monitor to improve performance, sometimes I just don't want windows to hide on the laptop screen. Sometimes I want to output video to my tv and not have the laptop screen on. It really doesn't matter. This is not a "glitch" because the feature exists. It is just a shallow UI.