The Project Window is a floating/dockable window that displays a list of the files in the current project. Double clicking on an entry in the Project Window list opens the file. Dragging a file onto the Project Window from Explorer or File Manager adds the file to the project. There is also a toolbar at the bottom of the Project Window for other commands relating to projects.
The Project Window can be toggled on and off by running the Project Window command. You can activate and set the focus to the Project Window by running the Activate Project Window command. This command will make the Project Window visible if it was hidden.
If a project is open, then the Open command activates the Project Window.
If the Context Window is open, then it will display the contents of any files selected in the Project Window.