Click the title bar and drag the command
window until it is over the top or bottom docking region of the
AutoCAD window. When the command window becomes the same width
as the AutoCAD window, release the mouse button to dock it.
The docking region is
an edge of the AutoCAD application window that allows you to dock
a toolbar, palette, or the command window.
Right-click the title bar of the Command
window, and select Allow Docking.
NoteYou can control whether
the command window docks by right-clicking the title bar of the
command window and then clicking Allow docking.