Courses must be taken in sequence; therefore, some Lessons will not be available until you watch the previous lesson. If you are a Staff user then you cannot watch courses or lesson out of sequence.
Admin and Managers can view all courses and lessons in their library, regardless of sequencing or prerequisites. They simply need to select the "Lessons" or "Courses" view from their Library tab. If you are not assigned a seat in a Product, then you will not be able to view the Courses or Lessons or Resources of that product from the Library tab. You must be assigned a seat in the product in order to see the training content.
Staff - Lessons
Admin - Lessons (in the Library)