Variable: org-property-format
org-property-format is a customizable variable defined in org.el.gz.
Value
"%-10s %s"
Documentation
How property key/value pairs should be formatted by indent-line.
When indent-line hits a property definition, it will format the line
according to this format, mainly to make sure that the values are
lined-up with respect to each other.
Source Code
;; Defined in /usr/src/emacs/lisp/org/org.el.gz
(defcustom org-property-format "%-10s %s"
"How property key/value pairs should be formatted by `indent-line'.
When `indent-line' hits a property definition, it will format the line
according to this format, mainly to make sure that the values are
lined-up with respect to each other."
:group 'org-properties
:type 'string)