The additional content region normally spans the entire screen width. Inserting a row snippet after full-width content will allow you to include content that only spans the main content region.
A page includes several editable regions. A site’s homepage includes three editable regions and an interior page includes four. The editable region buttons are shown as green buttons on the page after you have clicked the Edit button in the Page Actions Toolbar. Additional Editable Regions can be found in the section properties files, discussed later in this workbook.