>>>On a form I take into account the the font, fontsize and field size to determine the .Width setting for controls. How do I do the same thing in the Report Designer?
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>>use Format/Font options of Report Designer menu.
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>What about calculated and concatenated values that aren't created by drag and drop? Also, what about when I need to change the font size of different fields?

To be honest, I don't create report fileds by drag and drop at all. If you need to change some filed font individually then you just select it individually and use Format/Font option.