To change the columns in your Mailbox
In the Main Window, open the folder you want to change columns settings for.
To remove a column, drag the column heading off the column bar.
To change the order of a column, right-click or Ctrl+click a column heading > click More Columns > click a column name in the Selected Columns box > Down or Up.
To add a column, click a column name in the Available Columns list box > Add.
Click OK.