This function is intended for the case when you have changed the map scale and the locations of the controls need to be re-scaled to match the map.

If you change the map (using the Setup Map dialog) from scale 1:15,000 to a map of the same terrain with the scale 1:10,000, the control circles no longer match the map. With the larger scale, the circles need to be "spread" further.   The re-scale function can "stretch" or "shrink" the control location coordinates proportionally to the change in map scale.

If, however, the new map is not simply an enlargement of the old map, but is also shifted, then - after using this function - the controls will appear to be correctly located relative to each other, but shifted relative to the map.  To fix this, you need to use the Move Map function to move the map in place.