How can I hide this bar

Hi,

I'm trying to hide the bar that shows up on top of the lister just below the toolbar. I've got no idea what it is called so I was unable to find anything in the forum.
This is what I mean:

myimg.de/?img=20140909214644cc99b.png

Any ideas?

Cheers,
Manuel

Typical - as soon as I post I find what I am looking for:

It's in the preferences under "File Displays" - "Border" and then select "Display as a static header"