How to clear the Jump List for Remote Desktop?
Solution 1:
Jump Lists are stored as files in %AppData%\Microsoft\Windows\Recent\AutomaticDestinations. The file for Remote Desktop is called 1bc392b8e104a00e.automaticDestinations-ms.
Delete it to clear the Jump List.
Restrict its file permissions to block Explorer from changing it. Make it a zero-byte file to forever block the Jump List for this program.