Menu refers to the list on the left side of the page, such as the menu of the Demo below contains Customers and Companies.
Sorting menus is very simple, use
MenuOrder to sort menus as you want by slug name .
Menu group and icon
MenuGroup can merge multiple items into one group, as shown in the following code.
ModelBuilder can set the item icon, and set menu group icon by
Icon strings can be found at https://fonts.google.com/icons.