If a window is docked outside the Client area, you move it as follows:
1. Click and hold the cursor on the title bar of the dockable window you want to move.
2. Drag
the window to move it:
While moving the window, guidelines boxes will show to show you where that
window will be placed when you if you release the mouse as shown here:
.
If you move the window to an outside edge (or not on top of a guidline
box) and release the mouse button, the window become Float. You can also
prevent the window from docking and keep it as a floating window, by press
the CTRL when you move the window.
For an overview of Dockable windows, see Dockable Windows.