\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addUserTSConfig('options.myextension { setting = value }');
\TYPO3\CMS\Core\Utility\ExtensionManagementUtility::addUserTSConfig('options.myextension.setting = ');This will remove the `setting` setting from the `options` configuration group for the `myextension` extension. In both examples, the package library being used is the TYPO3 CMS Core Utility package.