Unwanted appearence change in Mail

[Jynto]

So I reinstalled GrowlMail today, and now my Mail is stuck looking like THIS.

Each message now takes up two lines, and the subject column now displays redundant information. I did not change the settings to get this. It happened just after I reinstalled GrowlMail. Whether or not it was the uninstalling or installing that did it, I don't know. Uninstalling it again did not change anything. I have a Time Machine backup. Which preference file could I restore to make it go back to normal?

I am running Snow Leopard 10.6.8 on a 13'' late 2009 MacBook Pro.

 

[Jynto]

Nevermind. I fixed it, and it had nothing to do with GrowlMail. It's not a bug, it's a feature of the Mailbox plugin, which I must have turned on without realising