The align panel gives some control over the positioning and scaling of the explored object within the scene.
The size slider on the left allows to control the size of the explored object. What is actually measured is the diameter of the object's projection to the horizontal plane. This means that tall and slim objects will initially be very high, so you might want to reduce their size. The default size is 22 meters, the maximum is 100 meters (equal to the size of the non-flat terrain geometry).
The offset slider allows to change the height above ground of the explored object. Setting offset to maximum will allow you to walk underneath the object.