I would create a new subsection; therefore, you have two sections of information. Details-A and Details-B .
Put [Product] [Weight] [Quantity] in Details-A and put [Note] in Details-B below.
Then, in the expert section, select Details-B and click the formula button. Use the formula to suppress a section when [Note] is not populated; sort of:
if isnull([Note]) or [Note]='' then true else false
This will suppress the section of the note if its space is; thereby keeping the size of your partition.
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