Disable chat to a friend
If you want to quickly disable chat with with particular contact on Facebook:
- Open a chat window with your contact.
- Click the gear located at the top right of the window and select "Turn off Chat for ..."
To revert the changes, follow the below procedure:
- Click on the gear icon at the bottom of the chat window > Advanced settings
- In the window that opens, select "Turn on chat for all friends except" and clear the names for the contacts you want to restore the chat feature: