Disabling custom comment pages.

[linear]

There's a feature to do so on livejournal, and I'm pretty sure you can do it here on dreamwidth, too. (I've seen it! This journal is also proof that you can disable it.) But how do you do it? I've tried looking around for an answer, but I couldn't find one. I looked under Presentation, and it says this:

"Disable customized comment pages for your journal
OBSOLETE: This option has been moved to Account Settings"

I checked under Account Settings, but I couldn't find the option to disable custom comment pages. Please help me! @~@