Install and activate the plugin, then open Tools → AnyWareX Debug Switch.
AWXDS explains the required integration before making any change. You do not need to edit wp-config.php yourself.
WP_DEBUG_DISPLAY remains disabled.Use Enable Debug or Disable Debug. AWXDS controls the state with wp-content/awxds-debug-on.flag. The same page can display, download and clear wp-content/debug.log.