Played around with it and it was interesting. I have to filter the thing though to remove unplayed games. Once I only put the highly rated, I’m pleased to see that I only need 1.5 bookcase.
My 4x4 Kallax is small enough that I know how to arrange things. Same sizes tend to stay together to maximise space use. The abhorrent TTR-size ones stay together. Carc-size games, the same. I made full use of the Kallax’s depth, which gives me space at the top half to put a game there horizontally.