I am seeing this now in L5-

See the long line of megaphones in the passage? I find this distracting. Since each one seems to be pointing to some additional information on each of the names in the previous list, I also find it redundant...I can get the same (or more) info in the Information panel by clicking on a name.
What is the official name of these little critters, what do they do (I must be missing something here), and is there a way to turn them off?