Text justification in auto-height box shape

[RichRif1]

I'm using auto-height boxes to contain paragraphs of text. I'd like the boxes all to be the same fixed width and have the height adjust based on the text, as you'd expect the shape to do - and it does.

However, I'd like the text to be left justified and it does that when the text is long enough to fill (or nearly fill) the width of the box but when the text width is narrower than the box width the text moves towards the center of the box... it begins to look like the text is center justified but I think it's because the left and right margins of the text box are changing based on the text width and the box width.

Does anyone know how to change the auto-height box such that the text remains left justified in this situation? Left justified being such that the left margin appears the same for auto-height boxes with long or short text for a given box width?