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>>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.
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>I'm probably not asking this right, so let me try another way. You place a field control on the report that will contain a value of type C10. The field control now takes up a certain amount of space on the report. Now you want to size the control big enough to allow for the maximum value and also small enough to prevent dead space on the report. How do I determine the size of the control?

Try to print a dummy field containing Repl("W",10). This is the widest character available - if it fits, everything will fit.