Progress Line

Why is it that the progress line in P6v7 only points on activity bar and not including the milestone? I only show baseline bars in the schedule. I want to see progress line by connecting progress points based on activity’s percent complete but the progress line only points activity bars which are progressing and no progress yet and not including the milestones which do not have progress and already behind schedule. What shall I do in order for the progress line to point also the milestones? What I remember in P3.1, the progress line also points milestones. Thanks!