Select Options® 2D options to call up the 2D Options dialog window.
Setting the Background color option causes the background for the 2D frame to be colored a particular color. You can specify this color by setting the 2D background variable (in the Color Assignment menu).
If you turn this option off, the background for the 2D frame takes the color of the background for the entire view. The sections "The Background Option" and "The Background Indicator," in the section "The Global Options Menu" provide more information on how the view background is set.