I am a Jira Admin. At some point when we upgraded to 4.5.6, I saw the "customize" button on our service portal and clicked it. Suddenly, the appearance of my portal changed completely. And I can't change it back? How do I change it back?! No one else's portal looks like this.
The original portal looks like this:

Now it looks like this! I wouldn't care except I sometimes teach users how to use the portal, and it confuses them. Thanks for any help!