Three are several approaches.
1. You can configure the menu width with a fixed value, say "900px" (you can configure this under the CSS tab on page Drop Down Menu)
or
2. Give less value to the "Padding Left/Right" field when customizing your menu on page http://www.menucool.com/drop-down-menu#view3;
3. If you have configured your menu width as 100% , after you download the menu, you can open the ddmenu.css with Notepad, and add "min-width:600px;" after the line width:100%;
You can change above 600px to the value when your menu starts wrapping so that your menu will never wrap.
4. Using media query in CSS as demenstated in page Responsive Menu
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