click this icon at the top right of the video box to show the playlist menu. Then select your video title. Finally, click the video box to hide the playlist menu.
If you are having trouble hearing the video, you may find it helpful to turn on the automatic captioning by clicking this icon at the bottom of the video box towards the right.
Click this icon found at the bottom right of the video box to change the video to fill the entire screen. click the same location to change back to the normal view.