PDFFRAME

Type: integer · Stored in: session · Initial value: 1

Frame of the PDF underlays in the drawing.

Value	Frame
0	Hidden (the frame of an underlay whose file is not found is shown anyway)
1	Displayed and plotted
2	Displayed but not plotted

With 2 the frame shows on screen but is not plotted or exported. The setting applies to the session (AutoCAD saves it in the drawing).