I just looked at some of our documentation dated back to 2003 where we setup some ZTerm's on Pocket PCs’s (for stock picking and scanning), these run in 10 rows x 40 cols, but all I can find is:
Emulator -> Set Terminal Rows to 10
There is nothing to do with columns, from what I can see, maybe it defaulted to 40.
So, sorry that’s really not much help, maybe I should download a trial version again and have a play...