How do I use the Fixed Width editor?
Open the Theme Editor for your event. How do I open the Theme Editor?
Select the Theme Type option from the dropdown menu of page elements.
Select any page element from the dropdown menu. The tool panel will refresh and display the settings that can be changed for that element.
Below is the entire list of page elements for the Fixed Width Layout only. Note that there are no "layers" in the Fixed Width layout. A background image, if selected, will be applied to the entire website page.
Page elements for the 100% Width Layout are in this article: How do I use the 100% Width editor?