Hide Your Screen
When using your Mac you might want to keep some things out of sight. There are a couple ways to do this. If you have gestures enabled, you can pinch outward with four or five fingers on your trackpad or Magic Mouse. This will cause all windows to move off the display and show the desktop.
You can also set up “Hot Corners.” Hot Corners will let you trigger an action by placing your mouse in one of the four corners of your display.
You can configure Hot Corners in System Preferences under the Mission Control settings. Click the Hot Corners button to get started, then select actions for the corners you want to use. There are many options that will hide your display. You can use the screen saver, put the display to sleep, or lock your device entirely. There are also lots of other options you might want to try.