Align:

• positions the objects relative to some reference point
  • last selected
  • first selected
  • middle of selection
  • world origin
• min - move objects so that their minimum bounding box values are aligned
• center - move objects so that their centers are aligned
• max - move objects so that their maximum bounding box values are aligned
• rotate - rotate objects to match the reference. This option does not work with the middle of selection reference point

Distribute:

• positions objects evenly within a selection. the order is determined automatically based on the spread of selected objects in the x,y and z directions and on the active axes
• min - move objects so that their minimum bounding box values are evenly spaced
• center - move objects so that their centers are evenly spaced
• max - move objects so that their maximum bounding box values are evenly spaced
• space - move objects so that they have even space between them
• rotate - interpolate the rotation values of the objects between the most outer objects by location

Axis:

• Control which axes are active for a given action
• Click the X, Y or Z buttons to toggle the corresponding axis
• Some rotations may require all axes to be active because truespace may express rotation values as combinations of all axis values. This is especially true for the y axis rotations.

Undo:

• runs the undo command repeatedly the same number of steps it took to align the selection
• only 1 undo
• must be run immediately for best results