To Turn Layers on and off in an Underlay

1. Select a PDF underlay by clicking its bounding frame.
2. Right-click and click PDF Layers.
3. In the Underlay Layers dialog box, click the light bulb icon for the layer name that you want to turn on or off.

   You can use CTRL or SHIFT when you click to select several layers.

4. Click Apply to save your changes, or click OK to save and close.