Moves users’ personal settings pages from Setup to a separate My Settings pane, and makes a reorganized Setup pane accessible via one click in the header. This setting affects all users in your organization.
Setup > Customize > User Interface > Improved Setup User Interface
Setup is displayed when you click on the name
Setup arranged in following order.
Now let’s enable Improved Setup User Interface in user interface. (By default when new salesforce account is created.
Setup menu is displayed separately.
Setup menu is also rearranged.