This article covers the Legacy editor. Lessons built in the New editor work differently. To move around and reorder a long lesson in the New editor, see The page outline and navigating long lessons. New to the difference between the two? Start with The new lesson experience.
Reordering blocks
Open the lesson from My Library. The Legacy editor shows the lesson as a list of blocks, with the Outline down the left.
Drag a block by its handle in the Outline to move it. The order in the Outline is the order students work through.
Click Save when you are done.

