When changing the coordinate system for the map in Surfer, the size of the map stays the same, but the limits of the map revert to the full data limits. If you applied custom limits to your map and then changed the coordinate system for the map, the limits will expand to include all data in all layers. You will need to reset the limits to your custom area.
If you wish the limits to remain close to what they were before changing the coordinate system, please email your vote for this request to email@example.com.
Updated September 26, 2017