By default popup notifier comes in enabled mode. If you don't like it popping up from your system tray and distracting your attention, you can disable it by following the given steps below:
- Open Preferences Dialog
- Select 'Notifiers' tab
- Make sure that the checkbox called 'Enable Popup Notifier' is not checked
- Click 'Apply' button to apply this change
To learn more about popup notifier, check out related help topic.