changing map sizes

[codman]

Need some advice about changing the the map size during a campaign. I started out with an 80x80 map and I seem to be stuck with that size even if I change the map size under the preferences in between battles. I'd like to get to a larger map and somehow I thought once you finished a battle the next battle you fought would pick up the settings from the preferences and apply them.

If I'm missing a setting, some enlightenment would be great!

Thanks in advance

Steve