Does anyone know if there is a way to change the background color of Baan sessions (not the menu browser) in BaanIV GUI?
If not, how about the fonts color/size? This would be useful to have if you work both in production and test env't.
Thanks.

No, BW customizations are not possible.
The BW picks the colors and fonts that the OS provides.

Customized (read compiled object) sessions can have different colors, but this involves coding.