Originally the Highlighting function was created to mimic the same function done in a paper Bible. In a paper Bible you can’t see a list of your highlights.
Nevertheless, technically it is possible, and we have received many requests for a list of highlights. Although, at this time, highlights are not currently viewable in a list (as Bookmarks or Notes are) we are considering providing such a list in the future, which would allow you to scroll through all of your highlights!