Apple DVD Studio Pro 4 - Manual (Page 156)

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To change only the widths of the left and right quadrants, drag the boundary between
the left and right halves left or right.
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To change both the heights and widths of the four quadrants, drag the point where they
intersect.
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To split either the vertical or horizontal boundary, so that you can resize two quadrants
while leaving the other two as they are, Option-drag the boundary you want to move.
This creates two intersection points, each of which can be dragged as needed. To
reconnect the split boundaries, drag one of them so that it aligns with the other, then
release it. They are now reconnected and will move as a single boundary.
When a horizontal or vertical boundary gets close to an edge of the user interface, the
boundary snaps to that edge, instantly hiding the smaller quadrant. This makes it easy
to quickly display only one or two of the quadrants. You can display the hidden quadrants
by dragging the edge back toward the center of the window.
156 Chapter 10 The DVD Studio Pro Interface