Adding Quadrants to the Basic and Extended Configurations
There are two ways to add quadrants to the basic and extended configurations: Choose
a different configuration or drag their edges in toward the center.
The basic configuration is actually just the upper-right quadrant with its left and bottom
boundaries dragged to the edges of the interface. To add a quadrant to the left half of
the interface, drag the left edge toward the center. To add a quadrant to the bottom half,
drag the bottom edge toward the center.
The extended configuration has the lower-left quadrant hidden. To add it, drag the
lower-left edge toward the center.