This article covers the Legacy editor. Lessons built in the New editor work differently. To add and remove blocks in the New editor, see Inserting content with the slash and plus menus. New to the difference between the two? Start with The new lesson experience.
Deleting a block
Open the lesson from My Library. The Legacy editor shows the lesson as a list of blocks, with the Outline down the left.
Open the block's own menu in the Outline and delete it. If students have already answered it, their responses go with it, so check before deleting a question that has been assigned.

