This article covers the Legacy editor.
Feedback type decides when students see their marks and comments.
Changing it
Open the lesson from My Library. Feedback Type is in the panel on the left, under the tutor.
Choose one of three:
Instant. After every question.
On submission. When the student submits the lesson.
On return. When you return the lesson, so you can moderate the marking first.
Click Save. On return is the one to pick for anything that counts, because it gives you a chance to check the AI marking before students see it.