remove grey bars recent and more articles in oxygen

Hi everyone,

I’ve tried to fix it by myself but I can’t figure it out!

I want to get rid of these two grey bars “recent articles” and “more articles” in the front page in oxygen theme.
But I want to keep the articles on “primary and secondary”.

here is a snapshot :
http://alienwp.com/documentation/oxygen-theme-documentation/

I have a child theme with a style.css file where i wrote
.breadcrumbs {display: none;}

It made the first grey bar “browse” disappeared but didn’t erase those two I’m telling you about.

I really appreciate your help !! I owe you one !

Lea