Resizing the list pane
If you think the list of address items (left-hand pane) is not wide enough you can resize it using your mouse.
Just drag the vertical divider between the two panes to the right (using your left mouse button).
To make the detail pane (right-hand pane) wider, drag the divider to the left.
Custom Addressbook will remember the size of the two panes the next time it starts.