This tab is only available for users with sufficient permissions when editing pages using Portal page or ASPX + Portal page type templates. Here you can add (), remove (), configure () and relocate web parts and widgets. Entire web part/widget zones may also be managed via their drop‑down menus ().
On pages using portal engine page templates, the layout code of the assigned template can be edited by clicking the Edit layout () button in the top right corner of the page template area.
Please keep in mind that any changes made here will also be applied to all documents that use the same page template as the currently edited page.
Page url: http://devnet.kentico.com/docs/6_0/contexthelp/index.html?cms_content_design.htm