I'm revisiting a 5.57 site and I can't work out how to edit the header area. In Edit mode every element on the page is editable except the header, which won't respond to mouse clicks to bring up the usual menus. Also, I seem to have added a drop shadow and background grid but can't work out how I did this (again as I can't edit the header). I've attached a screen shot. I'm guessing its the default Elemental Theme template.

I'll just add that this is only a single page header - not a global header.