During a call, you can verify the video you're sending to the far end by turning on the Picture-in-Picture window (the PIP). The PIP appears in the right lower corner of the main video window. You can turn it on or off any time during a call.
Tip: The toolbar is automatically hidden when you choose full-screen video. To display the toolbar temporarily, move your mouse.
To show or hide the PIP:
>> Click on the toolbar.