Building elevation - visualarq

what is the use of the building elevation?,
I change the hight there and does not affect the levels of the views.

The Building elevation determines the elevation of the levels included, which are relative to the Building elevation. If you change that building elevation, you should see how the elevation marks of their levels change their position in Side Viewports:

However, don’t expect any change on the location of geometry, which is not attached to any level or position. This is a feature expected in VisualARQ 3.