Toggle or turn off 'Always on Top'

I installed version yesterday, and now Directory Opus is 'Always on Top'. If I click another program in my task bar, Directory Opus remains 'On Top'. I cannot see any other programs without minimizing Directory Opus. This has never been the case in any prior version, and I need to know how to toggle it on/off, or at least how to turn it off.

Click the little pin to the left of the standard minimize button in the titlebar until it is pointing left, rather than down or diagonally down-left.