Arrange Menu
The items in the Arrange menu only affect selected objects in
the object layer. They have no effect on the paint or background
layers. You must select at least one object (and in most cases at
least two) in order for the menu items to apply. You can select
all the objects on a page by choosing Select All from the Edit menu
or the contextual menu.
Alignment
Align Left
Aligns the left edge of all selected objects with the left edge
of the leftmost selected object.
These 3 objects have been aligned on their left edges. 
Align Right
Aligns the right edge of all selected objects with the right edge
of the rightmost selected object.
These 3 objects have been aligned on their right edges.
Align Top
Aligns the top edge of all selected objects with the top edge
of the topmost selected object.
These 3 objects have been aligned on their top edges.
Align Bottom
Aligns the bottom edge of all selected objects with the bottom
edge of the bottommost selected object.
These 3 objects have been aligned on their bottom edges.
Align Centers Horizontally
Aligns the horizontal centers of all selected objects with the
center of the collection of selected object.
These 3 objects have been aligned on their centers horizontally.
Align Centers Vertically
Aligns the vertical centers of all selected objects with the center of the collection of selected object.
These 3 objects have been aligned on their centers vertically.
Stack Order
Each object on the object layer is arranged in an order from the
front of the canvas to the back of the canvas. That order is called
the Stack Order. You can change the front-to-back sequence of objects
on the object layer with the commands below.
In this illustration, the yellow object has been moved one step
forward or up in the stack order:

Move to Front
Moves selected objects to the top (or front) of the stack order.
Move Forward
Moves selected objects one position toward the top (or front)
of the stack order.
Move Backward
Moves selected objects one position toward the bottom (or back)
of the stack order.
Move to Back
Moves selected objects to the bottom (or back) of the stack order.
Grouping
Group
Joins selected objects into a single new object that can be selected,
moved, and transformed together. You can select multiple objects
by holding down the shift key while clicking the objects. You can
select all the objects on a page by choosing Select All from the
Edit menu.
This illustration shows 3 objects selected separately. 
This illustration shows 3 objects grouped into a single object.

Ungroup
Splits a previously created group into its individual objects.
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