This button in the Main Window sub-menu of the Attributes Menu and the Attributes menu of subwindows brings up a sub-menu containing three checkable entries: Boxes, Polys, and Wires. All three entries are checked by default. If unchecked, objects of that type will not be shown in the display in the corresponding window. The window will have to be redrawn to see the effect, the redraw is not automatic.
Display of labels and instances is controlled by other buttons in the same menu.