Find the non-friend that you want to remove by navigating to the people icon situated on the bottom right-hand side of the screen 3.
Not at all times, messages that have already been sent cannot be unsent or removed from your friend's inbox.
Opening a new Gmail account is easy for most people.
Should you create another Facebook account just for the sake of chatting with specific people? However, this will come as a message request.
There is a also a dedicated desktop messenger client.
Delete complete chat messages with multiple friends on Facebook in one single click and enjoy the freedom.