customize-apropos is an interactive autoloaded compiled Lisp function in `cus-edit.el'.

It is bound to <menu-bar> <options> <customize> <customize-apropos>.

(customize-apropos PATTERN &optional TYPE)

Customize loaded options, faces and groups matching PATTERN.
PATTERN can be a word, a list of words (separated by spaces),
or a regexp (using some regexp special characters). If it is a word,
search for matches for that word as a substring. If it is a list of
words, search for matches for any two (or more) of those words.

If TYPE is `options', include only options.
If TYPE is `faces', include only faces.
If TYPE is `groups', include only groups.