This menu is present only when the Atoms Window is active, and pertains only to the orientation of the structure as displayed in that window. The Pre-Calculation Rotation option in the Input menu is used to rotate the structure before calculation, to insure consistency with the basis functions - this should not be used to orient the view of the structure in the Atoms Window.
Cartesian Axes Rotate the structure around the Cartesian reference axes.
Structure Axes Rotates around directions specified in the coordinate system attached to the structure.
Remove Rotations Will remove all rotations made in this menu and with the buttons in the Atoms Window.
Align on Face or Vector Will align a crystal face to be parallel to the screen or paper, or a vector to be perpendicular.
Current Orientation Gives the direction of the structure axes in the Cartesian reference system.
Continuous Rotation Will automatically rotate the structure around one of the reference axes by a specified angle.