Fixed height can be assigned to any row via
pq_ht property of row data.
pq_ht works only when rows don't auto expand according to their content i.e., when
autoRow option is false
pq_ht work irrespective of
autoRow value, another property of row data
pq_htfix should be set to true
Row heights are changed by dragging the bottom edge of number cells with mouse / pointer device.
Double click on number cell bottom edge resets corresponding row height to auto i.e., row height is adjusted according to its content
To disable change of row heights via UI, set
rowResize option to false