Why shortcut icons are created in app list after installing more than 45 applications and cannot be deleted later in my Nokia Lumia?

The shortcut which appears in the application list is called the Jump list.

The feature of a jump list is as follows:

  • The jump list (alphabetic shortcuts) appear between groups of items when there are 45 or more items in the applications list.
  • The application list goes back to normal when number of apps are reduced. Specific shortcuts will appear/disappear depending on whether items beginning with that letter are included in the list.
  • The apps are automatically sorted alphabetically and cannot be manually changed.