In this demo, default menu is rendered with minimal configuration. This sample can be customized further with the combination of menu properties from the property pane. For example, You can switch to Vertical and Horizontal modes by clicking and selecting the orientation mode from Orientation dropdownlist. You can enable or disable menu items by clicking and selecting the item from Enable item or Disable item dropdownlists. You can also enable the show menu item on mouse click showItemOnClick property by checking the Show item on Click checkbox. More information about menu can be found in this documentation section.