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Onecode Barcode Height

Our Post Office is complaining that the height of the bars in the Onecode barcode is too tall.

It looks like the “extendedHeight” parameter, by default set to a value of “20”, is what I’d need to adjust down to something closer to 16.5.

My question is: can I change the default value of 20 somewhere so that all new instances in new templates have a different value (16.5), so that my users don’t have to remember to change this every time?

Correction: the complaint is that the height by default is too short.

Is there any way to change the default value of this?