Navigator
The Navigator palette is a tree structure containing the entire logical structure of your project. It is shown by default at the edge of your screen.

The Navigator contains all of your project’s viewpoints, views, Layouts and Publisher sets, listed in four maps.
Find and double-click any item in any map to open it.
Use the search field to locate items by name.
Once opened, the item is listed in bold.
Exception: You can have only one Floor Plan and one 3D window open at a time.
Read more on Graphisoft Community: The Navigator
Maps of the Navigator
Project Map
Tree structure of project viewpoints, organized in folders. Viewpoint icons (in Navigator and tab bar) are black.
View Map
List of the project’s saved views. A view is a stored version of a viewpoint; each view is defined by its View Settings, which you configure for a particular purpose. View icons (in Navigator and tab bar) are blue.
Layout Book
All the project’s Layouts with their Drawings, optionally organized into subsets, and formatted based on Master Layouts.
Publisher
Publisher map items are views and Layouts collected in Publisher Sets. Set output methods and format here.
Organizer
The Organizer is a special mode of the Navigator. The Organizer, with two tree structures side by side, makes it easier to move items from one map to the other.
Show/Hide Navigator or Organizer
Do one of the following:
Project Name in Navigator
The project gets a name once you save the project file.
If you enter a different Project Name in File > Info > Project Info, the Navigator will display that name instead.
Commands in Navigator
For any selected Navigator item:
Show/Hide Related Dialogs
Use the Chooser pop-up to show or hide the Navigator palette and related dialogs, or browse another project:

See also Place view from external project (Navigator Project Chooser)

