OptionalcolorOptionalidThe last bar left uncovered. Everything after it is dimmed. Null draws nothing at all, which is how a host keeps one instance around across entering and leaving the mode.
OptionallineThe rule at the cut. Default a muted blue, the colour of a chosen thing.
OptionallineDraw the divider. Default true.
OptionallineOptionalz
Wash colour over the covered bars. Default a dark, low-alpha neutral.