After you sign in, Cisco Jabber Video for TelePresence displays the control screen.
When you make or receive a video call, the Jabber Video video screen displays automatically. If you want to show the video screen when you are not on a video call, click 
in the upper-right corner of the control screen.
Mac: You can also show the video screen by clicking View > Show video from the main menu, or by pressing Command + 2 on your computer keyboard.