My experience with the Pro-100 and W10 is that printing direct from LR5.7 is a pita... you can't change paper size from the print panel, you have to go to the printer config. However having done that, the changes still do not show up in the LR print panel, so you can't set the margins etc (well sometimes, due to some random set of circumstances).
So changing paper size means: go to print mode, click printer, change paper size in the printer driver, close. *Exit* print mode, then re-enter to force it to load the new paper size from the printer driver. Set margins, and be sure you've emptied the printer queue (or you will print the wrong size), then hit print.
Changing to ABW mode also needs to be done through the printer config...
Using PPS, all that is done from the same place... I assume the same is true for PPS2.