org-goto-interface

org-goto-interface is a variable defined in `org.el'.
Its value is

outline

Documentation:
The default interface to be used for `org-goto'.
Allowed values are:
outline The interface shows an outline of the relevant file
and the correct heading is found by moving through
the outline or by searching with incremental search.
outline-path-completion Headlines in the current buffer are offered via
completion. This is the interface also used by
the refile command.

You can customize this variable.