org-indent-modeorg-indent-mode is an interactive autoloaded Lisp function in `
org-indent.el'. (org-indent-mode &optional ARG) When active, indent text according to outline structure. Internally this works by adding `line-prefix' and `wrap-prefix' properties, after each buffer modification, on the modified zone. The process is synchronous. Though, initial indentation of buffer, which can take a few seconds on large buffers, is done during idle time.