Go to the view menu, press L for layout, and tab and make sure you don't have use preview pane checked. Again, press alt V for the view menu. Press C for columns. Arrow down to subject. Press alt W for the pixels wide edit field. It will read you a number, delete that and try entering a larger number such as 350 to start. You may need to experiment. Enter for okay.

In the list of columns, make sure you don't have too many things checked. Maybe only attachment, from, and subject. If jaws doesn't indicate whether the item is checked or not, tab and if you find a show button that means it is not checked. If you find a hide button, that means it is checked and you have that column set to display.