If you feel that your conversation list has become too cluttered or you’d like to organize it, you can close any that you don’t want to see in your conversation list. Closing a conversation means that it will disappear from your conversation list, at least until the next person sends a message in this conversation.
If you’re part of a team and would like to stop receiving notifications from a team and remove it entirely from your conversation list, then you may choose to leave that team instead. Visit Leaving a team in the app desktop and web
to learn more.
Note: You will need to unfavorite the conversation before you can close it.