FAQ -> Screen Sharing -> Is it possible to keep the Presenter's webcam visible while the "Slides" are showing?

Is it possible to keep the Presenter's webcam visible while the "Slides" are showing?

Yes!

By enabling picture-in-picture mode, the Audio/Video window will change its position from stationary into floating. This means that it will be possible to move it wherever you want on the screen.

To know more, look at How to launch picture-in-picture?

Another possibility is to expand the view in the AV options.