org-show-hierarchy-above

org-show-hierarchy-above is a variable defined in `org.el'.
Its value is

((default . t))

Documentation:
Non-nil means show full hierarchy when revealing a location.
Org-mode often shows locations in an org-mode file which might have
been invisible before. When this is set, the hierarchy of headings
above the exposed location is shown.
Turning this off for example for sparse trees makes them very compact.
Instead of t, this can also be an alist specifying this option for different
contexts. Valid contexts are
agenda when exposing an entry from the agenda
org-goto when using the command `org-goto' on key C-c C-j
occur-tree when using the command `org-occur' on key C-c /
tags-tree when constructing a sparse tree based on tags matches
link-search when exposing search matches associated with a link
mark-goto when exposing the jump goal of a mark
bookmark-jump when exposing a bookmark location
isearch when exiting from an incremental search
default default for all contexts not set explicitly

You can customize this variable.