I just experimented with some polygons, it’s a nice tool!
One thing I noticed:
I always use a click into the map for closing item labels (pop-ups*), if there is a polygon area behind an item label, the click opens at the same time the polygon label and center the map on it.
It would be nice, if the first click into a polygon area closes current activated labels.
(and on mobile, the first click next to a label should not activate any other items.)