When both panes are open, there are tabs over on the side which you can click on to activate either pane. Then you can select which one moves out of the tab.

You can also click and drag the heading at the top of the pane to drag it out as a floating pane. You can even drag a pane over the left border of the window so it snaps to that side if you wish.

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Andrew Lockton
Chrysalis Design, Melbourne Australia