A simple plugin for Craft CMS that alters the Entries Index sidebar to list all Singles, rather than grouping them under a 'Singles' link.
Functionality can be turned off without uninstalling the plugin, reverting to the original layout.
Clicking on a Single in the menu will re-load the main index table with your lone Single. To go straight to editing the single, turn on the 'Redirect to Entry' option in the plugin settings.
Available for Craft 3, unlimited use, free forever. Get it from the plugin store.