Picture shows 2 to 3" apart, not 12" Looking at a veggie shop won't help if you have a different variety. Just try picking some leaves young they're very tender. Let a few plants get 12-15" harvest the whole thing. Experiment till you find what's best for you
Size of pak choi/bok choi also depends on variety. For the first time this year, I grew SHUKU variety (sold as a Master Gardener packaged seed at Big W and elsewhere). It has been by far the biggest, most tender and tastiest of any variety I have ever grown, it is slow to bolt and grows to about 3 times the size of what is in the supermarkets, but still tender after the outer leaves are discarded.
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