The Lesson Plan shows for each lesson to what extent your students have achieved the learning goal of that lesson. You can see this under the lesson with the colored blocks with initials, namely the learning goal statuses. Based on this, you can decide whether, for example, to give additional instruction to certain students.
Students with a yellow block are stuck. They probably need extra instruction before they can continue working on this learning goal. Students with a light blue block are moving towards the target level and can continue working on the learning goal independently. Students with a dark blue block have reached the target level.