NotePanel layouts cannot
use panels that have been torn off. If you select a panel layout
that includes a torn-off panel, Maya displays a warning that it cannot
use the panel. Any available panel is used instead. For
example, the built-in
Persp/Outliner panel
layout usually places the
Outliner in
the left pane and the
Perspective view
in the right pane. If you tear the
Outliner off
into its own window, a warning is issued and another panel is put
in place of the
Outliner.
Once you close the tear-off
panel, it can be used by panel layouts that include it.