If you want to blanket disable all notifications, there are two options.

  1. Use focus mode to turn off notifications. You can do this by clicking on the bell in the bottom-left, selecting "Disable notifications" and turning it on until turned off (attached)

2. Use macOS to disable all notifications for Wavebox. You can do this in macOS System Settings > Notifications. Then scroll down the list of apps to find Wavebox, and then Toggle OFF (there should be two entries for WB).