To expand on the helpful comments others have made, I found that in 2020 ProSeries you need to print a Client Copy of the return to be able to put a user-defined watermark or no watermark on the K-1's.  I am now using no watermark as I have found that any watermark tends to confuse some K-1 recipients.  To do no watermark, you check print Client Copy, uncheck Mask Sensitive Data if it is already checked, check Watermark and fill that space in with a couple of blank spaces, and then check Mask Sensitive Data, in that specific order.  Best regards to all, I have found this forum where practitioners can communicate with other practitioners to be extremely helpful.