I have a dark background bitmap that makes seeing unselected line segments impossible. If a line segment is selected, it is yellow (the default) and very visible. In Rhino Options > Appearance > Colors, I can set the color of the selected object. Where is the setting for unselected objects?
All objects are placed on layers. You can use Layer command to display Layer panel and to assign colors to layers. If you assign color to layer, the objects on this layer have the same color as the layer, unless you select the objects and override this color in the Properties panel.
Great! Thanks very much.