How I do I increase book randomization in Arena GUI?

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I've downloaded Harry Schnapps' Grandbook.abk, it's a fairly big opening book at ~144mb. I followed the instructions for the book settings but there is not a lot of variety in the engine's opening play

I did disable the engine's own book and checked the 'use Arena main books' option.

I don't need (or want) the engine to play only the best openings every game, how do I increase book variety so the engine will play lesser known openings? Thanks!