If you accidentally click the “Leave” button during a virtual group, you will land on the following page. Click the “Re-join” button and as long as the group is still active, it will allow you to rejoin the meeting.
If you accidentally close your browser window or tab or lost internet connect, you can rejoin the meeting by clicking on the meeting link (or, if you lost internet connection, refreshing your browser tab or window your virtual group was in prior to losing connection). This should work whether you are the facilitator or an attendee.