To acheive a wider page with no right column you need to turn off the 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 right column?" field.
- The option needs to be set at "No" and this will turn off a right column. The default will display a space for the right column as will "Yes"
- Save your changes.
See Metadata Screen capture.