In a folder labeled ProPDF

I think when you print a return to pdf it tells you which folder has it, when you're finished.  Mine end up in my Documents file in a folder labeled TY20 (or TY19, etc.) but I think that's because I set it up that way. 

I believe you have to create a PDF in the printing menu, and look at the ProPDF folder where the software automatically save the pdf's

Angel Rivera