Hello,
Referring to the support thread here:
https://support.displaylink.com/foru...ve-10-14-early
"Some MacBook 2018 models on 10.14 may experience black extended display(s) with only mouse cursor. DisplayLink driver v4.3 Beta 6 stays available to force an AirPlay extended display on these machines until a fix is distributed.
Driver v4.3 Beta 6:
http://www.displaylink.com/downloads/file?id=1184"
Regards,
Szymon