Players Subbbase window is the same to Custom Subbase.
By the way, vertical scroll bar for list of subbases, located at the right side of the frame, has slightly unusual view.
Add new Subbase function is also very similar to the same from Custom Subbase
The differences are:
There is no Choose button, because you need not choose filter to build subbase. Just enter player name in the corresponding Edit field.
There are possible to build another two Full Board Fuseki files: separately for black and white.