Icon in a MIDI region

Hi, simple question, i didn’t find the info in the manual (or didn’t find where to get this info). : a sort of “automation” icon in a MIDI region (upper right corner) : i don’t know why it is showing in this particular region and not in the other ones on the same track or in the project…
thanks…!

Well. Self-reply…
It was the “group” command : select regions and choose “group” in “edition”.