3.9.6. Leaving a Chat 
You can leave from an active group chat. This chat will be removed from your
Chat history tab by clicking on the actions menu 
icon in the title bar of the chat window and selecting
Leave chat.
You have successfully left the group chat. The other participants will be notified
that you have left the chat by a short message in the chat’s window.
INFO:
Once you leave a chat you wont be able to see the chat’s history. You can only access
the certain chat history if one of the participants adds you again.
‣ Parent topic: Section 3.9. Chat