Not sure what "micro-justification" is.
On justified text you can have large chunks of white space between words. This becomes easier to find if you increase font size.
KO offers a way to tweak both "between words" space and "between characters within a word" space, so the text looks better without all those empty space nonsense. I think you're talking about that.
The later is called "word expansion" and the former "word space" and both are available on the bottom menu, in the fonts section, just below "font size".
|