First you have to select objects that you want to align.
Then click appropriate buttons in the Format toolbar to align selected objects to each other.
You can align objects to:
Left
Horizontal center
Right
Top
Vertical middle
Bottom
Center horizontally on label
Center vertically on labelYou can also distribute object evenly, so that spacing between them is equal:
Horizontally
VerticallyNote: All objects are aligned relatively to the master selected object.