This article best describes the different resources of Microsoft Teams specific to their chat feature. This article goes over how to start a one-on-one private chat as well as a group chat with other collaborators as well as how to name the group chat if applicable. The article finally addresses how to see the different collaborators involved in a conversation and how to add additional collaborators.
This article provides instructions on how to create a pop-up window for your existing chat sessions.
This article provides instructions on how to hide chat sessions and then unhide when you need them again.
This article provides instructions on how to leave a chat in Microsoft Teams, as well as how to hide or mute a chat session.