You can leave full screen mode now by hitting the Escape key on your keyboard.
We’ve now covered the basics of navigating between documents and using full screen mode for distraction-free writing. Now it’s time to meet the Inspector. Click on “Inspector” in the toolbar (the blue disk on the right, with the “i” inside it; or press Ctrl-Shift-I). A third pane will appear on the right of this view.
You may find this text a little scrunched up now. If so, click on the “Maximize” button at the very the top-right of the window (the middle icon that appears in most Window’s windows).

Right, let’s look at the inspector. At the bottom of the inspector, in the footer bar, you will see these buttons:

The padlock button on the far right allows you to “lock” the inspector to a particular editor when the editor is split—we won’t worry about that for now, though, as we haven’t looked at splitting the editor yet. The other buttons allow you to choose what to view in the inspector (the number of buttons that appear will depend on what you are viewing in the current editor). The last button, “Snapshots” (the one with the camera) is only available for text documents, for instance. An asterisk next to one of the icons tells you that there is content in that part of the inspector. In the screenshot above, the document has a snapshot (an older version of it has been saved to memory for safe keeping). This document you are reading has a “Reference”, which will cover soon.
To begin with, make sure the leftmost button, “Notes”, is selected, and then click on the next document in the binder, “5a: The Synopsis Index Card”.