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The columns can be resized and dragged to different positions and that, as well as everything else about the bookmark dialog - its size, position and sorting - is remembered.
A very nice feature is the fact that a bookmark includes the position! So you can bookmark different problems in the same problem collection, different Joseki variations in the same Joseki dictionary or different positions in an interesting game. Such bookmarks are distinguishable by their variation number and their comment. An example of a variation number is g3v2m5, meaning: Game/problem 3, variation 2, move 5.