The left part of the window displays the structure map with all objects. In which type of hierarchy the object should be a part is selected here with the alternatives under Start from.
Structure map in the Administer Properties, start from group/user.
Comment: A saved "default value" in a procedure can consist of several objects. There will be one object per saved value in the Search form/Create tab. For example, a default selection will become one object. If you also save a default list type in the same Search form/Create tab it will be displayed here as another underlying object called "own" under the same procedure. (See the image below).
Example of several objects in the same default value.