If you do not want to use your laptop display you may close the lid and work using only the monitor as a display.
For PC:
1. Left-click on the windows start-up menu in the bottom left hand corner or press the windows key on your keyboard
2. Left-click on the gear icon on the left-hand side or type settings
3.Once in the settings go to System>Power & Sleep options>Additional power settings
4.Once in Additional power settings, in the left pane click on "Choose what closing the LID does
5.Change to "Do nothing" on either plugged in or batter power based on how you plan on working
For Mac: