The Layer List widget provides a list of 2D or 3D layers in the scene.
Configure the Layer List widget
There is no configuration for the Layer List widget.
This widget can be set to open automatically when
an app starts. Click the Do not open this widget when
the app starts button 
on the widget to turn on the option to open the widget automatically. (For widgets you need to add to the app first, you can make this setting after configuring the widget.)
Use the Layer List widget
To use the Layer List widget, do the following:
- Click the Layer List widget to open it.
- Check the boxes to turn layers on and off in the scene.
- Optionally, hover over the layer and click the Go to full extent button to zoom the scene to the layer's full extent.