When you use the Remote Desktop Connection Tool in Windows to make a connection to another computer, the name of the computer to which you connected is added to the Remote Desktop Connection Computer box. This is done to make things easy for you. The next time you want to connect, you can easily select the computer.
Over a period of time, the list of such entries may increase, and you may want to delete them. The Windows Remote Desktop Connection Tool does not offer any way to delete or remove this history list.
Remote Desktop Connection Clear History
If you wish to delete them, you will either have to use the Windows Registry or simply download and use a Microsoft Fix It.
1] If you want to manually delete the entries from the Remote Desktop Connection Computer box in the Windows Remote Desktop Connection client, type regedit and hit Enter to open the Registry Editor.
Navigate to the following key:
HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client\Default
The entries will appear as MRUnumber, and are visible in the right pane. Right-click the entry and select Delete.
2] A freeware called Remote Desktop History AutoCleaner also lets you do the same. It is available here.
Remote Desktop History AutoCleaner monitors every Remote Desktop connection and cleans connection history. It works in the background and is lightweight.
3] Alternatively, you could download and use Microsoft Fix it 50690 to remove history entries from Remote Desktop Connection Computer automatically. [UPDATE: Microsoft Easy Fix solutions are no longer supported]
Hope this helps!
Read next: How to change the listening port for Remote Desktop.