Apple Logic Pro 9 - Manual (Page 97)

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Set the default size for plug-in windows in the Logic Pro > Preferences > Display > Mixer
pane. This scaling applies to all plug-ins.
Working at Different Hierarchy Levels
Logic Pro allows you to view projects at an overview level (Arrange level) and also at a
microscopic level (editor level). These different hierarchical levels are designed for different
types of tasks, such as arranging project sections or refining instrument parts. In many
cases, you can switch between these different display levels directly, without needing to
open or access another window.
Normally, the editors are at the lowest display level, which shows individual events within
the selected region.
Clicking the Hierarchy button in the top-left corner of a window or window area moves
the displayed view up one level (generally to the Arrange level).
Note: Double-clicking the background of the editing area of a window also moves up
one display level.
97 Chapter 4 Customizing Your Window Setup