When you add a new page or edit an existing page this view will appear. A lot of frames are displayed (for example categories). In this article you will find an explanation for every framed feature:

• Categories to specify that page to a certain categorie
• Classic mode vs Backend editor
• Discussions and Comments are (not) allowed for visitors
• Featured Images 
• Google Optimization (Smartcrawl)
• Media
• Page Options
• Page Title
• Permalink
• The Page Builder