Can't Minimize Windows Remote Desktop (RDP)

When doing a Remote Desktop on Windows (RDP), sometimes  for convenience  we will maximize display screen (full screen). But have you ever locked and can not be back to minimize? .. And you have to do is to log off to get out of the RDP, when in fact we do not want to logoff and just want to be disconnected.

How can I minimize the Remote Desktop display when it is locked or want to return back to the local computer?
The way is to press  the Ctrl + Alt + Break on the keyboard

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