org-display-internal-link-with-indirect-buffer

org-display-internal-link-with-indirect-buffer is a variable defined in `org.el'.
Its value is

nil

Documentation:
Non-nil means use indirect buffer to display infile links.
Activating internal links (from one location in a file to another location
in the same file) normally just jumps to the location. When the link is
activated with a C-u prefix (or with mouse-3), the link is displayed in
another window. When this option is set, the other window actually displays
an indirect buffer clone of the current buffer, to avoid any visibility
changes to the current buffer.

You can customize this variable.