I understood exactly what you meant the first time.
Top left small map visible during normal gameplay: Minimap
Press M you get a big map: Map, or Parchment map.
On the Map, below your cursor there's a square window showing you the creature icons and stuff: Zoombox
Originally: Minimap could be zoomed with the buttons next to it, or with the + and - keys.
Now: Both the minimap AND the zoombox can be zoomed. The zoombox just witht he + and - keys.
The zoom levels are linked though, and linked in the middle. I let you know, in case you were unaware, that you can change the zoom level of the zoombox directly at the mapview if you are unhappy with the zoom-level there. But indeed, you would need to turn it back each time for the minimap.
Zooming the zoombox out more is hardly useful, as then at the max zoomout level, it would be as zoomed out or more as the mapscreen itself.
I many people dislike the current link I could 'simply' try to disconnect them.