A system configured to host a teleconference session is disclosed. The system hosts a teleconference session between a plurality of client computing devices. The system provides transitions of displayed content between various positions of a user interface that displays a teleconference stream. The transitions can occur in response to an event that changes a state of the teleconference session, where the state of the teleconference session can be associated with a total number of users participating in the teleconference session. Accordingly, in various examples described herein, a change in state of the teleconference session can be attributed to an event in which a user joins the teleconference session or an event in which a user leaves the teleconference session.