Default properties are the properties the program uses when
adding a new object. You can change the default properties of an object after
you click the object's toolbar button, but before you actually finish adding the
object. (Any changes you make after the object has been added will only affect
Default properties are stored with the landscape, not
globally. If you want to use the default properties from one landscape when
creating a new landscape, first save the existing landscape as a new one and
then delete the unwanted objects.
Whenever you start a new landscape (by starting one from
scratch or by selecting File > New), all default properties are
restored to their original settings.