Purpose of the guide
It tells the user how to delete messages or hide chats within MS Teams .
Hide chats, delete messages
While it is not possible to delete a complete chat, it is possible to hide a chat from the chat list if it is no longer important. Select the chat you want to hide, then select More Options > Hide.
If you need to retrace your steps and delete an item you just sent, go to the message and select More options > Delete .