remote desktop port
Remote Desktop > Advanced Settings is extremely user-unfriendly for changing the RDP port.
I correctly shows my current port number, and it has a link for changing the port number. It redirects to a very technical link [https://docs.microsoft.com/en-us/windows-server/remote/remote-desktop-services/clients/change-listening-port] that surely scares a lot of people into doing that.
There should be an input box for setting the new port number, and after changing that it should restart the service without needing to restart the operating system.