I need to set my app Notification "Show Previews" options to "When Unlocked (Default)". How can we configure it using the UNNotificationSettings? I do not see an option to configure it.
Control Notification “Show Previews” option programmatically on iOS
Strictly a user control. That's a good thing.
Your app can't do this, and you don't see an option, because this setting can't be programmatically modified by code. Push-notifications display according to the settings enabled by the user on her/his device.