in your css file, you could modify:
#leftbar to have 223 width
In css, you could also change this:
Code:
.menu-categories-list ul li a:link, .menu-categories-list ul li a:visited, .menu-categories-list ul li a:hover, .menu-categories-list ul li a:active
to have a smaller font size (13px is the largest without making it into 2 lines)
Additionally, you can add this:
white-space: nowrap;
to the div ".menu-dialog .content" which will force the text to not wrap. You will still need to either reduce the text size or increase the width, as it will be partially cut off.