Overhead chat visible for private conversations

Can someone please tell me how to turn off your private messages from showing up overhead while in blessings? Its very annoying and could be a violation of privacy… I only think it shows up in Blessings but have occasionally seen it in the town area.

you do realize that only you can see these messages correct? unless you are talking in zone chat

not true. As another person asked me if I could see their chat over their head and I said yes. It also appeared in the town area also. This happens when sending a private message to someone outside the zone that I am in also. I see others having the same issue. Their response shows up over their head. So why does this not happen to everyone then? Why can’t it be turned off?