In the Thread Pane where your messages are listed?

You see that bar with the labels "From", "Subject", "Date" and so on? Well, they are buttons. You can click on them to sort your messages. You can also drag them with the mouse left and right to reposition them, and you can drag their ends to change the column widths.

These are standard computer actions; you can do all of this in Windows Explorer ("My Computer") too.

In Thunderbird, a right-click on any of these buttons will reveal a pop-up menu where you can select and deselect the columns to control what is shown.

More here: http://www.ramsden.org.uk/8_How_to_sort.html

Hi Zenos,

this doesn't solve my problem. I've tried dragging the buttons, but nothing happened. I can only adjust the column widths as you've mentioned. Do you have any other suggestions?

Thanks

There are no other suggestions. That is how it works. Left click on the header that you want to move, hold the left button down and drag it to where you want it and release.