ZBrushCentral

Cant locate backface masking

Watching tutorial and they are accessing backface masking from masking dropdown. It is not included in my dropdown. I am using 4r2. I think they’re using 4.
I also tried finding from brush menu and no luck there either. Maybe I turned something off by accident?
thank you

Brush / Automasking menu and select Backface

thank you!