Screen size with foxbase+ 2.1.2d + Openserver 5.0.7

Hi, i'm running SCO Openserver 5.0.7 with foxbase+ 2.1.2d. Is it possible to change the screen size to use more than 25 lines / 80 columns?.

Clients connect using PuTTY, they can enlarge the SSH client window, but the application still runs in the original window size.