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Select the text box or shape, then select Home > Text Direction.
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Choose the direction you want—horizontal, rotated, or stacked.
More options
In PowerPoint for the web, a text box can rotate on its center point, but letters can't be stacked vertically or reversed. The desktop versions of PowerPoint can do these things.
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Select the text box or shape you want to rotate.
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Click and drag the rotation handle in the direction you want to rotate the text.