To acheive a full width page with no left menu or right column you need to turn off the left menu and right column in the metadata of your asset.
- Go to the "Metadata" screen of your asset.
- Scroll down and find the Tier 5 - Section & Themes - "Show left menu?" field and "Show right column?" field.
- The option needs to be set to "No" for both of these fields.
- Save your changes.
See Metadata Screen capture.