When the windows size is smaller. The top level menu items will auto wrap. The top menu items will display in mult-lines.

I want all top menu item display in single line always. 

Thank you!

Hello Che,

If you need to prevent the menu wrapping you could do it by using following css:
This will keep all listed items in line regardless of the parent width.

The other possibility is to use Kendo Menu scrollable configuration. If you set it to true, you will enable the scrollable functionality.

In the the following Dojo you could find examples for both ways of displaying the menu.

Regards,
Neli
Progress Telerik