TYPO3 v9 has reached its end-of-life September 30th, 2021 and is not maintained by the community anymore. Looking for a stable version? Use the version switch on the top left.
You can order Extended Long Term Support (ELTS) here: TYPO3 ELTS.
The WEB > Info module displays a variety of information related to the pages in your web site. It contains several functions which can be accessed from the dropdown menu in the docheader. For example, the Localization Overview lets you quickly identify which pages are translated and which are not. You can also so set how many levels down the page tree you wish to analyze.