Translations:Global settings/15/en
From LimeSurvey Manual
The Global settings dialog is only available to administration users with the right Settings & Plugins. It can be used to adjust certain settings of LimeSurvey in a global context. In versions earlier to 1.87 these Optional settings were only available when editing config.php/config-defaults.php. Starting with 1.87 the values in config.php/config-defaults.php serve merely as a default value. Once you enter the Global settings dialog and saved once then the values will be overruled by the settings in the Global settings.