The Gadgets section has an Appearance setting to "display an assessment of an article's quality in its page header". https://en.wikipedia.org/wiki/Special:Pref

The Gadgets section has an Appearance setting to "display an assessment of an article's quality in its page header". https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsection-gadgets https://en.wikipedia.org/wiki/Special:Preferences#mw-prefsec... The lock icon is a different issue, it is used in a subset of controversial or high-profile articles to limit the types of editors that can edit it (from requiring editors to be logged-in to a temporary full edit block during disputes).