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Scenario : The standard cylinder for mapping in PS is a tall and skinny shape. I want to map to a "tuna can" shape. How do I edit the dimensions of the cylinder I want to map my 2D art to?
Select the object and change the Y value in the Coordinates screen for the Properties Panel
You can also click-drag the Y arrow (the green one)
Make sure you have "uniform scaling" deselected also:
Required, but never shown