Yes. In the toolbar/menu bar of the desktop app, there is a Preferences item. From there, access Notification Preferences to enable or disable the following options:
- Show Notifications
- Play Notification Sound
- Auto-Dismiss Notifications
- Display Sender in Notifications
- Display Message Preview in Notification
- Snooze Desktop Notifications
If you are using a Windows or Linux machine and have hidden the menu bar, you can press Alt + M to re-show it.