Game Version number: 1.2.1.169
Modded: No

Group invitation cannot be dismissed, so it stays on the screen all the time. It's really annoying in the night.
There are only two ways to turn it off:

1. Accepting invitation. Not always viable. When I'm a team leader I will lose it when I join new group and then go back to my old group. When I have radio deployed, I will lose it if I'm the only member of my group. Even if there are other players in my old group, but the group is private, getting back may be a nuisance because not everyone knows how to accept new member.
2. At Game settings/Interface/Prompts, hiding Notifications. If I set it to hide, I don't see if base is being captured, what bases are captured etc.