You can click and drag a pane to a new, docked position within the File Cabinets window. When you drag a pane to a dockable position in the window, the pane's outline snaps to the docked position.
A pane can be docked to any border within the File Cabinets window, including borders of other panes. The status bar at the bottom of the window is an exception, but you can dock a pane directly above it.
If the pane will share a docking position with another pane, the pane's outline changes to include a tab. For information about sharing docking positions, read the following section.