Bring up the World Menu by clicking on the left mouse, or Select, button any empty spot within the Squeak window. You know you got it if the label at the top says "World". If you are in a squeakland image, this does not work; instead, hold the mouse over an empty spot and press Esc on the keyboard.
The World Menu object is an instance of the class TheWorldMenu.
See Menus. Extending the menu