Bookmarks navigator

Dear megasuke, yes it is the case. But problem is once we add the 20 bookmarks in navigation and choose the horizontal. It looks odd so i just to check if we can show it likes Slicer. Let suppose that we add 20 field in Slicer and do the horizontal then we can manage the height or size of that slicer so that it looks good but in bookmarks navigator if there are 20 fields then it's being very difficult to manage the size of that bookmarks navigator because on the page there is no more space oy would be better if we can manage it like slicer so that we can read all the bookmarks easily. If you need screenshot i can share the same.pls suggest