Auto Spotlight for Host

[jennizenn]

I attended a meeting once where the host had her screen on auto spotlight / pinned. There was no way for anyone to see another screen, just the host, but we knew others were there from the chat and participant menus. 

So I looked at how to do this for myself and can't find it in settings or in searches online and customer support provided nothing on this topic. 

Does anyone have experience with this and know the proper settings?

Thank you!