You could also more than likely push the F11 key to do so. When you’re in full screen, you can push the Esc key to return to Ubuntu, or hover your mouse cursor once more to the bottom to get the controls again. If you find that your mouse pointer won’t vanish when watching videos, move it to the direct center of the video or one of the vertical edges and wait several seconds. It should vanish along with the video controls, which is important when watching full movies.
