How to default to unpinned Remote Desktop connection bar?

Option 1: Add pinconnectionbar to your .rdp file

Pinconnectionbar

This setting determines whether or not the connection bar should be pinned to the top of the remote session upon connection.

Syntax

pinconnectionbar:i:<value>

Values Values Explanation
0 The connection bar should not be pinned to the top of the remote session.
1 The connection bar should be pinned to the top of the remote session.

https://technet.microsoft.com/en-us/library/ff393714(v=ws.10).aspx

Option 2: Add Value to Registry

In HKEY_CURRENT_USER\Software\Microsoft\Terminal Server Client add a DWORD value PinConnectionBar with the same values as above. This option works the first time. However, the Remote Desktop Client deletes the key afterwards.