To pop-out the Mini Menu, click on the gray List icon in the top titlebar (three lines, on the right, at the very top). If you're busy working outside of Wavebox in another app on your computer, you also have the option to pop-out the Mini Menu to your desktop - this provides a real-time list of everything that's new across all your apps.To customize badge and notification settings for each app, just right-click on any app icon and select Settings > Group Settings to find a section on Badges & Notifications.You can make general changes to your notifications in Settings > Notifications where you can choose a different sound for each app and adjust the volume.
You will also get desktop notifications for your apps too, and you can mute them using the Focus Mode icon at the bottom of the sidebar (red no entry sign).Badges will appear on (1) the group icon in the sidebar - a total for all apps in the group - and (2) on the app icon in the top toolbar. Unread badges will appear on your app icons when there's something new to see.