Home Screen and Screen Saver

Once the device has booted, it will automatically open at the home screen.

If you ever want to return to this screen, just continue swiping from top to bottom until you reach the homescreen. 

This action is explained in more detail here.

Screen saver

Your screen may go to standby if it is idle for too long to save battery life. 

Tap twice on the touchpad to bring the screen back up on your display.