In version 2.2.1.1, zooming of offline maps stopped at the map created levels. Since 2.3 I can oversoom to a fuzzy image or zoom out to where there is no map displayed at all.
Hi, please check the latest v2.6 - there is a setting for that. Go to system Settings, scroll down and find the Galileo app in list, the set "Allow overzoom on map" setting as you wish. Hope you will like it.