Once the app user has bookmarked items, there are two ways he can see those items: the Bookmarks AppBlock and the Bookmark Filter action button.
Set the AppBlock as the target for a button, tab, Menu List row, or Fly-out Menu row, and the app user can go there and see all bookmarked items. This can include items from multiple AppBlocks. Each item will be shown in the style of its AppBlock's List View. When the app user taps an item in Bookmarks, it goes to the Detail page for that item.