The Outliner shows the hierarchy of all objects in the scene in outline form: You can expand and collapse the display of branches in the hierarchy, and lower levels of the hierarchy are indented under higher levels.
The Outliner includes objects that are normally hidden in the view panels, such as the default cameras. You can control what objects appear in the Outliner using the menus and the text filter box. For example, type *top* in the box and press to only show objects with the letters top in their names.
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