Plesk and forward www to non-www

Problem
- How to change www site to non-www with Plesk
- How to forward www site to non-www with Plesk
- How to forward www.domain.com to domain.com
- Where's Preferred Domain in new Plesk 11.0.9

Solution for Plesk 11.5
Click on Websites & Domains > Hosting Settings > and change Preferred domain to None

Solution for Plesk 11.0.9 and Older
Add DNS Record WWW > CNAME > DOMAIN.COM.