Greetings!!!
For Batch Print initially we add the files from project wise. When they are added from the respective folders its easier to add. When we have Document set; where we have all the drawings placed for easy access, those files from Document set don't show up as a result this option is not available for us to perform Batch printing. Can you please check and confirm if our observation is correct??? Solution: If such option is not available at the moment. Please ensure its included in the later version. Thanks Kalai