Showing multiple levels on a map

Certain features are mapped with level=* to indicate floor position (e.g. "level 1 is above level 0, and level -1 is likely underground"). Is there a map rendering that shows this for a specific level only? Especially in cities, you could have multiple features above each other, and most maps just show all of them.

I do recall there was a map where you could select "only show me things that are on level N", but I can't find it now.