Deleting Runtime Properties 
This function deletes all of the area’s runtime properties that were saved. Once deleted, the runtime properties assume the state that they had directly after the area was created. The default values from the area definition are used when the area is used.
Note
In the case of areas that are not client-dependent, this is the only way to delete runtime properties in order to reinstate the default values. In the case of client-dependent areas, the runtime properties of individual clients can be deleted or overwritten with the default values in the change dialog.