For a change in the system settings to take effect, you must click the Apply button.
After you click the button, a progress bar indicates that the settings are being applied. You can resume working with the system after the process completes.
If you want to discard changes and have not clicked the Apply button, click Cancel.
If an attempt is made to close the Client but not all changes have been saved yet, a dialog box asks whether to confirm closing or to cancel closing and save changes.