Layers remain hidden until they are triggered to display. Most often this is because of something the learner did, a mouse click or hovering over an object. For example, there might be a highlighted word on a slide, when the mouse is hovered over the word, a definition appears and, when moved away from the word, the definition disappears. The hover action invokes the display of a layer and moving the mouse away triggers the hiding of the layer.
Follow these steps to display a layer by mouse action: