There are no documents talk about that. Please help me. Thank you
Admin top menu is created automatically based on group item in admin service definition. All admin services can be grouped and are displayed in top menu.
Example (see group="sonata_page" where sonata_page is name of menu group):
Admin side menu can be created with configureSideMenu() method in your admin service.
Example
来源：https://stackoverflow.com/questions/14837194/how-to-display-top-and-side-menu-in-sonataadminbundle