Controlling display of details in Master Detail form

Hi
I have a Master Detail form that opens up only in update mode. The master record is display only and only one of the detail fields, "Qty Fulfilled" is editable and the rest are display only. So, the form currently, has a text box only for the Qty fulfilled field.
I set the # of detail rows option to 5. So my form shows a column of 5 boxes, even if there are only 2 detail row.
How do I hide the remaining 3 boxes which have no data in them?
Please help , this is urgent.

btt

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