Globe map, changing size of bars on the map when zooming to certain country

Good day all,

I am currently strucling with the size of the bars on a 3d graph. When you zoom into the actually area the bars are of such size that the cover almost the whole map.

Is there a way to adopt the size of the bars?  I would like to have multiple bars in the same region.

Many thanks for your help!!!

Kees