On MacOS, "Allow notifications when mirroring or sharing the display" is turned off by default. Since DisplayLink uses the screen-sharing process for external monitors, this causes all system/app notifications to be hidden by default. A regular user might not know why this is happening or how to fix it.

DisplayLink Manager should either warn the user upon setup or not use the Mac screen-sharing process.

Default Notification Center Settings:
https://imgur.com/a/2YxguKr