using Gnucash on a small monitor

[Jim]

We recently installed Gnucash on an older laptop with a small 
(800x600 max) screen.  The problem we're having is that some of the 
dialog windows (like the "add a new account" window) resize 
themselves so that the drop-down window boxes become so small that 
they're unuseable--i.e, the drop-downs become thin slits with only 
the "up" arrow in the scrollbar showing.

Is there any way around this problem?  Would resizing the system 
font to a smaller size help (they seem large to me)?  If so, how 
would we do this?  We're using icewm as our window manager, not 
Gnome, btw.

-Jim