A Zen Master Page defines:

• left and/or right side column content for every page
• sections to position at the top or bottom of every page (use the section designer's Position field)

Master page side columns can only be edited from this page.

Use the Page Display Details option in the CONFIGURATION toolbar menu (the "gear") to toggle display of:

• Breadcrumbs
• Page Title
• Author, Lasted Edited
• Labels
• Comments

Except for sections positioned at "top" or "bottom" (in the section designer), your regular page contents will replace this center section.

To add images or other attachments to the master page, you must place them on a page in another space.

(This is due to optimizations that Confluence makes; see Zen's help documentation for more details.)