How do i get rid of these Messenger notification pop-ups?

A

AC Question

Hey, folks - I've always hated Messenger's "Chat Heads" thing, and disable it as soon as possible. I just upgraded to a Galaxy S6 edge+ though, and once I disabled Chat Heads, I started getting these irritating notification windows. They show up nomatter what I'm doing, even if it's a game or something that takes up the whole screen. I can't find any way to get rid of them short of disabling notifications for the app entirely, which I don't want to do... I want to be notified of new messages with a chime/vibration and with an icon in the top status bar, I just don't want this window appearing all over whatever I'm doing! Here's a screencap, just replace the dashes with "com". imgur.---/ok7shD9