Front/Back slider - align books with the front/back side of the shelf


Random - add randomness to depth alignment, where 0% means no randomness and 100% means ultimate randomness, where Front/Back slider has no influence.


Left/Right slider  - align books to the left/right side of the shelf


Random - add randomness to side alignment of all shelves, where 0% means no randomness and 100% means ultimate randomness, where left/right slider has no influence to the side alignment.


Stick to sides - force all books in the shelf to align either to the left or to the right side of the shelf.