The length of the vectors can be changed
with the Size combo box.
This is also an editable box, enter a new size and press return.
To avoid cluttering the display you can
define the number of grid points that are skipped
with the Skip interval combo box.
A skip interval of 0 mean show all vectors, 1 means skip every
other vector, 2 means show every third vector, etc.
This is also an editable box, enter a new skip interval
and press return.
Click on Show Streamlines to toggle between vectors and
streamlines.
When displaying as stream lines the Density slider allows you to
change the density of the display.
The color button is both the color of the selector point and the color of the vectors in the display.
Set the line width in the display. Click on the 
to change the value.
Click on the Levels box to see a pull down menu of the
native grid levels. Click on one level value to reset the
plan to that level. The plan level in use is shown
in the data's native altitude units.
The Levels box is editable. Click in the box, enter
a value and hit return to set your own value.
Click on the Cycle check box to animate
vertically through all available levels.
Another way to adjust the height of a Vector Plan View through a 3D field is
to drag the selector point (a colored rectangle)
near the lower left corner of the plot to a
new height. The 3D display has to be rotated to see the display
somewhat from the side to do this. The color of this selector point
can be changed through the Edit->Selector Color menu.