for a generic field, format field, general table, suppress x-2 button,
isnull({table.field}) or {table.field} = ""
for the header, section expert, suppress x-2 button,
but here is could be trickier. If you want the same condition as above that's fine, otherwise you will need to craft a statement that returns true when you want the header to be hidden, false to be displayed.
HTH
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