In windows server 2019 and windows 10. There is an issue in the RDS world where the windows overlapping each other appears to have no border (its all white) Making it hard to distinguish the various windows from each other. This can be fixed with the steps in this post.
If you are running Windows autopilot on devices you may experience issues during enrollment/configuration after the 1903 update.
The issue comes when deploying Windows store apps with autopilot, and you may get faced with the enrollment process giving you an error when it gets to this step.