display link manager detect my monitor as "No Monitor"
 

This is a screenshot when the DisplayPort adapter is connected to the Mac, but the DisplayPort adapter and monitor are not connected.
https://imgur.com/a/PDXohtR

This is a screenshot when the DisplayPort adapter is connected to the Mac, and the DisplayPort adapter and monitor are connected.
https://imgur.com/a/I22GU7U

The display link manager clearly sees that a monitor is connected,
and the monitor is actually shows screen

However, I can't find this monitor in my Mac's system settings.
So I can't set resolution, refresh rate, arrange.