XFCE 4.10: New window's top decorations hidden behind panel

[Chris Angelico]

On Tue, Mar 5, 2013 at 6:07 PM, Silvio Knizek <killermoehre at gmx.net> wrote:
> Every panel has the optiin to preserve space or not. Look in your panel
> settings.

Debian 7, Xfce 4.8. My panel options include "Lock panel" (ticked) and
"Automatically show and hide the panel" (not ticked). Where do I find
the option to preserve space? Google isn't showing anything up for me.

Chris Angelico