No black screen when iphone control PC

[Legyptien]

Hi

I tried to find answer in this site but I couldn't even if I think that I'm not the only one who experience this pb.

I have teamviewer on 3 devices: 1 laptop, 1 desktop, 1 iPhone 4s.

When I try to control the desktop with the laptop, I can go to settings and activate the black screen and unactivate the mouse control. But when I control the desktop with the iphone I don't have this option...

Is anyone can give me a solution please do it in detail as if I were a baby or a 65 yo guy...

Thanks