How to remove descriptions in the header label on clients statements

[ian_roberts]

My bad - looking again at the structure in my browser “inspect element” tool, the row classes are invoice label, not invoice details

so you need

.invoice-details-tbl .invoice-label-row3,
.invoice-details-tbl .invoice-label-row4,
.invoice-details-tbl .invoice-label-row5 {
  display: none;
}