The top row of keys on your keyboard (F1-F12) are known as the function keys. One of them should have an icon on it that looks like 2 monitors. Hold down the Fn key (in the bottom row) and press the function key with the 2 monitors on it. Repeated pressings should garner some results.
if 1shado1's fix doesnt work you can try the window button + P key combination to tell it to duplicate your screen 😀, there are a couple different options when you press windows + P so you may need to push it a few times until you hit the correct one