What the heck is screen rotation?
Screen rotation is the combination of hardware and software that allows you to rotate a display on demand between portrait and landscape orientation. It is also called display rotation and portrait/landscape pivot capability. Here are some photos of my setup. It is simple to re-position the large central monitor (shown in portrait orientation) back to landscape. No rebooting is required. Note also that with the monitor arms I can float the monitors in front without obstructing access to the midi keyboard.