Tutorial Builder: Page navigation
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At the bottom of the tutorial pane, you'll see the page navigation tools. This is how you can switch between tutorial pages and add and delete pages, too.
From the left, here's what they do:
Page Navigation. Click the arrows to advance or go backwards through your tutorial.
Click (+) to add a new, empty page.
Click the Duplicate button to duplicate the current page.
Click Trash to delete the current page.