The "EAN barcode" always uses a fixed size. If the field size is smaller than the fixed size it will not display.
In order for you to see the bar code you would require to either increase the size of the field in your Master PDF or you can use the option of the Positioning Tab in e-Doc Builder to force the field size to be larger than what you set on the PDF.
Path: Admin > Template > Edit > Field Setup > Expand Field for Bar Code > Positioning > Adjust the size according to the size required for Bar Code.
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