If a user doesn't want to view the historical one-to-one or group messages after deleting a friend or leaving a group, the user can choose to delete the conversation.
Caution:
When a conversation is deleted, the historical messages will be deleted from both the client and the server and cannot be recovered.
Multi-client sync is disabled for conversation deletion by default and can be enabled in the Chat console.
Deleting a Conversation
Call the deleteConversation API (Details) to delete a specified conversation.