If the desktop is extended, you will need to use both your MacBook screen and the classroom preview screen to adjust resolution. Select the resolution that works best for you. On the Display window, select the Display tab. If you do not wish to have the same windows on both screens do not check this box. This option will duplicate what is being shown on the laptop screen to the projector.
The Mirror Display check box is located in the bottom left corner.Under the Displays window select the Arrangement tab.
Please note that not all monitors change input the same way.Ĭhanging MacOS Display Settings When Connected to an External Display