By default, the Alignment toolbar contains tool for controlling the alignment of markups in a document. All the buttons on the Alignment toolbar will be grayed out if no markups are selected. The buttons on the toolbar become colored and active depending on the number and type of markups that have been selected. If an alignment tool is not active, that means it cannot be used on the selected element or elements. See Aligning Markups for more information.
If the toolbar is currently hidden, go to View > 
Toolbars and select it to show it.
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Align Left (CTRL+ALT+L): Aligns the left edges of two or more markups to the left edge of the first markup selected. |
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Align Top (CTRL+ALT+T): Aligns the top edges of two or more markups to the top edge of the first markup selected. |
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Align Right (CTRL+ALT+R): Aligns the right edges of two or more markups to the right edge of the first markup selected. |
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Align Bottom (CTRL+ALT+B): Aligns the bottom edges of two or more markups to the bottom edge of the first markup selected. |
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Align Center (CTRL+ALT+E): Aligns the vertical centers of two or more markups to the vertical center of the first markup selected. |
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Align Middle (CTRL+ALT+M): Aligns the horizontal middles of two or more markups to the horizontal middle of the first markup selected. |
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Center in Document: Aligns the centers of two or more markups to the center of the page. |
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Align Width: Makes two or more markups the same width of the first markup selected. |
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Align Height: Makes two or more markups the same height of the first markup selected. |
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Align Size: Makes two or more markups the same height and width of the first markup selected. |
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Distribute Horizontally: Distributes three or more markups along their horizontal plane. |
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Distribute Vertically: Distributes three or more markups along their vertical plane. |
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Flip Horizontal (CTRL+ALT+H): Flips one or more markups horizontally. |
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Flip Vertical (CTRL+ALT+V): Flips one or more markups vertically. |