1. Go to the desktop. If you have multiple tabs open then simple click on the bottom right corner on the taskbar.
2. Then right click on the middle of the screen and select display settings from the drop down option.
3. Scroll down on the tab opened and select Duplicate these displays under Multiple display.
4. However if you are changing it to extended display then please make sure you change it back to our standard display that is duplicate these displays after you are done with your class or meeting for the next person convenience.