Turning Off Overlays in Google Earth

There are many different layers that can be turned on in Google Earth to provide your students with additional information. For example, Rumsey Historical Maps will overlay a historical map over the current image of the earth for you to compare. There are NASA satellite images that you can overlay on top of the earth as well. However, once they are turned on, how do you get them off? I tried clicking the link, "Hide this layer", but the overlay didn't turn off. (See picture of overlay below)When you activate an overlay, the overlay moves from the "Layers" window pane to the "Places" window pane. Once you find the layer in the "Places" window pane, uncheck the box to the left of the layer, and the overlay will be removed. (See below)