Extensions Plugin Manager Edit Action Log Group
From Joomla! Documentation
Action Log Group
Action Log - Joomla
Record the actions of users on the site for Joomla core extensions so they can be reviewed if required. If this plugin is enabled the latest actions appear in a module in the Home Dashboard:
If the plugin is disabled then the Home Dashboard module does not change. It displays the most recently logged actions.
To view all User Actions Log entries select Users → User Actions Log in the Administrator menu.