You can use the list box on the Draw toolbar at the bottom of the Graphics window to quickly show or hide masked items.

The options apply for all masked points, masked scanlines and masked triangles, dependent on whether you have selected to draw that item. For example, masked points will only be shown/hidden if the Draw Points button
is selected.
This option replaces the Draw Masked Points button
and the Draw Masked Scanlines button
, available in versions of CopyCAD prior to CopyCAD 5.5.
To show/hide all masked items: