You can turn layers on and off in an underlay.
By default, all visible layers of an underlay are turned on when you attach the file. It is usually convenient to turn off any unneeded layers to reduce the visual complexity of your work.
DWFLAYERS, PDFLAYERS, DGNLAYERS, or ULAYERScommand or right-click a selected underlay and click Layers on the shortcut menu.
Use theYou can use the Properties palette to determine whether any layers are turned off in an underlay.