A dialog in a dock, with the “Close Tab”
If you want to remove a dialog from a dock, there are two ways you can
do it. First, if you click on the drag handle area and drag the dialog
away, releasing it someplace other than a docking bar, it will form a
new dock in its own right. Second, clicking on the
“Close Tab” button (highlighted in the figure to the right)
will close the frontmost dialog.