By default, the secondary-level submenus of the Menu UI component are displayed on the same event as the first-level submenu. To set another event for displaying secondary-level submenus, use the showSubmenuMode property. Alternatively, you can change the event on which the first-level submenu is displayed. For this purpose, use the showFirstSubmenuMode property.
ShowSubmenuMode enum to specify this property when the UI component is used as an ASP.NET MVC 5 Control or a DevExtreme-Based ASP.NET Core Control. This enum accepts the following values: