Course Navigation Next

We seem to be missing the “Next” button in the bottom of the screen (as discussed in this topic). Now to progress in a course, learners must use the course outline on the left side, but the next section must first be expanded before the Start button appears - it is not intuitive. Any guidance on a better user experience is greatly appreciated.

clarification, there is a “Next” button when taking quizzes, but not in normal course navigation.