Line space between titles - from "levels/folders"

Hi,

I’m new to this app. So, I’m experimenting little by little on my own to find the best formatting for my epub/mobi.

So, I have a questions here, though I tried to figure them out with no success:

  1. Is there a way to reduce the line space between the titles of two levels/folders, like the ones I attached here, on the prints? My intention is having “Introdução” closer to “Das Lembranças…”. How can I do that, please?

Thanks!
Captura de Tela 2014-04-01 às 19.03.12.png
Captura de Tela 2014-04-01 às 18.18.53.png

I have tried to change this with “Line height” and “Paragrapgh space after”, but none of these settings make something…