This COMPLETELY SUCKS.
Being able to change column widths and positions, click column headings to sort, and choose which columns to display is a BASIC FEATURE OF A COMPUTER.
Why does Apple insist on taking away basic and important functionality like this?
I archive my messages locally on my Mac, including sent messages. Once messages are moved into my local sent folder, the "To" column does not exist, and therefore I cannot sort by "To" to find messages I sent to different individuals, something I need to do quite often!
The inability to adjust column widths means that if I need to see just a little bit more information, I can't.
This is really a STUPID change, Apple. Get your act together and stop making the software more and more retarded with each new version.