A few suggestions:
(1) After selecting a specific bookmark group, it isn't possible to see all bookmarks across all bookmarks groups without going back and then returning to the page. Perhaps a clear filter button or see all group option in the dropdown?
(2) The default 10 bookmarks per page is too little. It would be preferrable to allow use to change the default bookmarks per page for all parents. Issue is compounded as currently bookmarks from one bookmark group will be split over 2 pages.
