Menu equivalents under
Align options will move all selected objects to align with one of the selected elements acting as a guideline for the others. For example, if you choose Align left, all objects will move to be aligned with the left-most object’s edge on the selection. The object that acts as a guideline does not move. If there are one or more locked objects selected they will be used as a “key object(s)”. And alignment will be relative to their boundaries.
If only one object is selected, the Align function uses the page limits as the alignment guide.
Align Left
Aligns all selected objects to the left side of the left-most object (left side of the selection bounding box)
Align Center
Aligns all selected objects to the center of the selection bounding box.
Align Right
Aligns all selected objects to the right side of the right-most object (right side of the selection bounding box)
Align Top
Aligns all selected objects to the top side of the top-most object (top side of the selection bounding box)
Align Middle
Aligns all selected objects to the middle of the selection bounding box
Align Bottom
Aligns all selected objects to the bottom side of the bottom-most object (bottom side of the selection bounding box)
Same width & height
or
Makes selected objects all the same width or the same height (the width/height of the selection bounding box)