Batch Print Group Column

Hello,

I am using a 30 day trial of Draftsight Premium in consideration for purchasing several licenses.  the functionality I need is to be able to batch print from multiple different DWG files and generate a single PDF file.  I am able to batch print but each DWG ends up generating a separate PDF file so a 10 page drawing creates 10 separate PDF files rather than 1.  I see in the batch print dialog that there is a group column with check boxes but they are grayed out so I can't click them.  

How do I get them to be clickable and will this group my batch print into a single PDF file?