https://help.syncfusion.com/cr/aspnetmvc-js2/Syncfusion.EJ2.Navigations.OverflowOption.html
Class OverflowOption - ASP.NETMVC-EJ2 API Reference | Syncfusion
Specifies the options of the Toolbar item display area when the Toolbar content overflows to available space.Applicable to popup mode.
api referenceclassaspsyncfusion