reduce space in SiteOrigin Editor

Hello,
I’m trying to reduce the space that is created automatically around paragraphs, using SiteOrigin Editor.
On this page http://www.laquestiondubeurre.fr/lhomme-seme/,
It works ok for the 2 first headlines, but under the title ‘Distribution’, I would like to get rid (or reduce) the space between the lines.
I need the two lines to be distinct paragraphs, as one has to be aligned to the left, and the next one aligned to the right.
But using paragraphs, space is added…

Thanks for your help.
Isabelle