I'm wondering the same thing. I'm editing a feature length documentary and use lots of markers in my interview clips to log content as I go. Its really annoying to see the 'USED' checkmarks interspersed with all my markers under a clip. I can't find any way to hide those rows & only see my markers. When you select 'Hide Used Media Ranges' under the View menu it only turns off the orange highlight on the bottom of the clip. It doesn't hide the 'Used' row in the list view of the clip.