Hmm, I can't find it either and honestly I think I missed it when/if it was available. A lot changed in a very short time in the earliest days of Cura 2.x. Perhaps @nallath is able to shed some light on it, or poke someone that can?
In the mean time you can play around with the different "Line width" and "Wall thickness" settings to close up those empty spaces between walls.
It's the newest Cura I think, I downloaded from the website last week. Under the ''getting started'' section of Mastering Cura. Maybe the option has a different name now but I can't figure what would correspond.
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