Course View shows you the course syllabus: a list of lessons with tasks.
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You can navigate to any task by double-clicking its name.
To hide the Course View window, click the Project Tool Window button or press &shortcut:ActivateProjectToolWindow;. This will give you more space for the Editor and Task Description windows.
To show the hidden Course View window, click the Project Tool Window button (or press &shortcut:ActivateProjectToolWindow;) again.