It's normally inside the epub, as it is a CSS property.
If it is not specifically set it should default to 2.
But for example Kepub renderer (ACCESS) completelly ignores this feature (value of 1). Although ACCESS allows you to set an external CSS file (complementary to the included CSS settings inside the kepub.epub file), it won't work either.
There's no direct GUI access to this feature in the kobo software. But please remember that even margin or font size settings which have GUI access can also be affected by the ebook internal CSS settings. (Because of that I talked about editing ebooks to kill margins)
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