I don't use the start screen, but I tested it (scroll bar to see beyond 8 items) with File > Start Screen.  At first I saw no scroll bar. After adjusting the angle of my laptop's monitor I saw a very thin scroll bar with the famous dark grey on black theme. I am not sure you can see it below.  Not sure if you are getting it on your display. Not sure if there are colors for the scroll bars in the theme editor, but I will look.  Maybe others know. For me clicking on the grey area did allow