Use Layers 
to view layer visibility and the legend.
Check the check boxes to turn layers on and off in the scene. You can also turn layers on and off in Layer Manager.
In Layers, you have the following options:
- Click Layers to view the layers of the scene.
- Click the Zoom to button
to zoom your scene to the layer's extent. - Click Legend to see the symbology of the layers.
- Click Layers again or another tool to close.