About Setting the Active Plane Orientation
Active Plane Orientation reorients the model so that the active datum plane is parallel to the screen.When you define curves in Style, all unconstrained points are projected onto the active datum plane, which is indicated by the grid display. It is important to be aware of the current setting of this plane whenever you are building curves. An active plane is set when you enter the Style environment. You can reset an active plane at any time, even while you define points for a curve.
Asynchronous datum planes that you create while within Style are listed in the Model Tree above the Style feature and are hidden by default.
The internal datum planes that you create are internal to the Style feature. They are listed in the Style Tree and not in the Model Tree. An internal datum plane becomes active by default when it is created.
The multiple view environment in Style is particularly useful if you need to use several different datum planes that are not parallel with the default datums. You can easily align the four views to any datum using the Active Plane Orientation command.
Active Plane Orientation command.Choose one of the following actions:
• Click Active Plane Orientation on the Graphics toolbar, or click 
Style > Active Plane Orientation.
Active Plane Orientation on the Graphics toolbar, or click Style > Active Plane Orientation.The Front view (lower left) is oriented with the active datum plane parallel to the screen, and the Top and Right views are oriented to their respective 90-degree rotations of the active datum plane.
• Right-click the graphics window in any view and choose Active Plane Orientation from the shortcut menu.
Active Plane Orientation from the shortcut menu.The specified view is oriented with the active datum plane parallel to the screen. No change is made to the other views.