I tried 2 times -- granted they weren't very honest attempts, I hoped to have it done in 5 minutes, but failed.
I am looking for a no-BS quick guide if you have one lying around.
2. Make sure your MacBook is plugged into power and an external display
3. Close lid
4. Your main desktop should show up on the external display. If your computer goes to sleep you can wake it up by clicking the mouse or typing on the keyboard.
Will that wake the internal display though? That would warm it up and that can be pretty bad when the lid is closed.
If your mouse is laggy and display looks fuzzy it means your external is mirroring your internal display and that your internal display is on. Turn mirroring off if that happens.
If you’re worried about heat (lid shut mode blocks the vent that runs the width of the keyboard) you can leave your lid open and use your external display normally.
I have not noticed a heat problem using my 2013 MBP Retina in lid shut mode after my two year old threw a phone at the screen (kids! Lol)
[Edit]I would then stock the labs with docking ports like something from CalDigit and LG displays.