Removing file name / header in V. 4.4.3.2 full screen mode

How does one remove the file name / header in the full screen mode of LibreOffice v. 4.4.3.2 ?

I am referring to the gray band above the top row / column letters.

This was absent in earlier versions of Libre Office. I am running it on Fedora 22 with Gnome.

Thanks!

You mean the horizontal ruler?