Auto printing individual PDFs in various size and orientations

Hi, in your changelog it says

Rhino WIP 2017-Feb-21 is now available.
This WIP includes:
New Features:
PDF: Option to make individual PDFs when printing Layouts

I can not get this to work though, neither I find the option to activate single PDFs.
For me printing multiple Layouts does not even create any PDF file.

Cheers,
phillip