Filter marked list

Filter marked list so that only those items in the marked list will show on the right pane, left pane, or search results. The opposite would also be useful, not showing anything in the marked lists at all.

Due to the nature and design of the marked list feature it would not be practical to use it for any type of filtering.

To have some sort of visibility filter setting (as a new/separate feature) is something I've considered for quite some time.