I had previously glossed over this feature when I saw it. This thread prompted me to consider it more closely: it is a subtle and elegant feature that really fits into the philosophy of using OO to provide a very screen-efficient display of potentially a lot of material.
Which begs the question of whether a similar feature will be available in the future iOS Pro version. I actually use the iOS version of OO the most because I find portable use of OO is very useful. I use the macOS version for bulk editing and production.
