Open your browser Developer Tools and watch for console errors. The toggle menu button is JavaScript driven. If you get different results with Debug enabled and not enabled you should know they use different resource files (css and js). Without debug enabled the the min versions are used (e.g. admin-menu.min.js). With debug enabled the none min versions are used (e.g. admin-menu.js). And the server may send the .gz version. There may be something wrong with your server set up. If all else fails, I guess you might try "Reinstall Joomla! core Files".
Statistics: Posted by ceford — Mon Dec 09, 2024 10:20 am