In Windows, there are two settings that can be used when dealing with multiple displays: Extended and Duplicated. For the purposes of teaching, it’s often helpful to have the image on the PC monitor mirrored (or duplicated) to the projector display. By default, the classroom computers on campus should be duplicated, but in the event the setting gets changed, here are a couple of methods to change it back.
1. In Windows 10 or 11, simply press and hold the Windows key on your keyboard and also hit the “P” key. (If you’re using Windows 7, skip to step 2B.)
2A. The “Project” menu will open from the right side. Click on “Duplicate” to mirror the desktop image on both the PC monitor and the projector (or additional monitor).