To enable or disable pop-up event notifications, please make sure the Event Notifications setting is toggled "On" to receive pop-up notifications and "Off" to disable pop-up notifications.
To adjust this setting:
- Click the "Yesware" drop down menu at the left hand side of Gmail
- Select "Preferences"
- Click on "Notifications"
- Toggle on or off the "Event Notifications" setting
- Click "Save & Reload"