For most other pages within a subsite (besides the initial landing page), you must follow the standard layout.

The standard layout is made up of the following:

• Page title above the content (pulled from the name of the page within WordPress)
• Content area below the page title (on the left-hand side)
• Navigation area for the subsite at the top of the right-hand column
• Contact Us and Directory will be the final two links in your sub-navigation menu (if applicable)
• No full-width widgets from the Advanced Editor

Along with that, the navigation will be handled in the following way:

• Name of the subsite will be on the top of the navigation (e.g. Library for the Library's subsite)
• Navigation items can be no more than three deep (otherwise it starts to look very messy)
• You can choose to have the navigation created automatically or to create custom menus

Besides having complete control over the content within your subsite, you can also add widgets below the mandated navigation for the subsite.