Stuck on Tutorial -- already

Began Interactive Tutorial with high hopes.
Got to the Edit section (about two paragraphs into tutorial).
Saw the list of links in the left-hand margin. (The one that includes Draft,Research,Trash, etc.)
Followed instructions to click the Alhambra link.
Got a lovely picture.
Clicked backward to the Edit section.
The left-margin list had disappeared.
I have tried every View option and many others, but cannot recover that list,
without which there is no way to do the Tutorial.
(Also checked the online Manual.)
Please tell this clueless newbie the obvious answer.

Click on the left-most icon at the top - the binder - that’s what you’re missing in the view.