Thanks for writing in!
Demo pages comes with classic elements (demo content). When you are creating a new page, by default the section that's there is a V2 section. If you click on Add Section link, it will add a V2 section.
As the background option is not showing up, please do the following:
- Under X > Settings > Permissions > User Preference > Advanced Mode select Always On.
To learn more about permission manager, please take a look at following resource.