Preview is the new lesson experience's safety net. Click Preview in the top right and the lesson opens in a private student view. You can answer questions, navigate between pages, watch videos, all without affecting any real student data.
What Preview actually does
Preview creates a separate working copy of your lesson at this exact moment. It doesn't:
Publish anything
Notify any students
Affect the version that's live in classrooms
Save to any student's submission record
If you change something in Preview (you can't, but if you could), it wouldn't carry back into your lesson.
When to use it
Before publishing for the first time, to catch typos and broken question logic
After editing a published lesson, to confirm your changes look right before pushing a new version
Whenever a student asks "what was I supposed to do on page 3" and you want to see the page from their perspective
During lesson design, to sense-check whether the flow makes sense end to end
Preview vs student view
If you've assigned a lesson to a classroom and want to see it as one specific student sees it (with their answers, their feedback, their progress), open the classroom view and click into their submission. That's the student view, and it's covered separately.
Preview shows you a fresh, anonymous student walkthrough. Student view shows you what an actual student is experiencing in real time.
Getting back to editing
There's a Back to editor button in the top left of Preview. Click it and you're back in your lesson, exactly where you left off.