Matthew N. answered 09/17/19
Top rated tutor - 100% success rate - No child left behind
By default on MacBook / Pro / Air, and on the small keyboard for iMac, the F11 key is mapped to special functionality, like decreasing the volume. All you need to do is hold down the "fn" function key (bottom left corner of your keyboard) while pressing the F11 key to trigger the show-desktop command