customize-themes

customize-themes is an interactive autoloaded Lisp function in `cus-theme.el'.

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

(customize-themes &optional BUFFER)

Display a selectable list of Custom themes.
When called from Lisp, BUFFER should be the buffer to use; if
omitted, a buffer named *Custom Themes* is used.