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.

Use the DWFLAYERS, PDFLAYERS, DGNLAYERS, or ULAYERS command or right-click a selected
underlay and click Layers on the shortcut menu.

NOTE:

If the Underlay Layers dialog box is empty, there are no layers in the underlay.

You can use the Properties palette to determine whether any layers are turned off
in an underlay.

• If no layers are turned off, the Layer Display Override property is set to None.
• If at least one layer is turned off, the Layer Display Override property is set to
  Applied.

Learning AutoCad

u 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  …Controls the display of layers in a DWF, DWFx, PDF, or DGN underlay. You can turn layers on and off to filter which layers display in an underlay. List of Options …Underlay Layers dialog box, click the light bulb icon for the layer name that … About Controlling the Display of Layers in an Underlay · About Underlays …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  …display at all, but similar results can be … The depth ordering of compositor layers is controlled by two factors: … To place them behind the eye buffer, set Current Overlay Type to Underlay in the Inspector.Underlay Layer node after a drawing node in the Node view, you can display only the node's Underlay layer output. The Underlay Layer node can  …Pdflayers. Works with Bricscad (Windows) Classic, Pro and Platinum, Bricscad ( Linux) Classic and Pro. Allows to control the display of layers in a PDF underlay.