Is this a custom menu that you are developing? If so, you could check RadMenu demo site
how to set the levels.
In case this is a build in menu - there is two options:
- Using the old navigation - RadMenu. In that case you can follow that article
and when drop it on your page under edit, you can set the levels
you want to show.
- Using the new Navigation widget introduced in version 6.1 - Kendo Menu. More information is available here
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