To loop more people into the conversation, just click Add people (or View and add participants in group chat) in the top right corner of Teams. Then, type the names of the people you'd like to chat with, select how much of the chat history to include, and click Add.
Note: When adding someone to a group chat (not a one-on-one), you can include the chat history.
Teams will save the whole chat history, all the way back to the first message. And if someone leaves the group, their chat responses are still there in your chat history.
Thank you for your feedback. Click Here to submit again.