Is it possible to change width a row in Grafana?

Grafana
1

I wanna change width a row in Grafana v5.4.2.
like this screen…

plz
plz1765×714 110 KB

I’m trying to change JSON Model…

"collapsed": false,
  "gridPos": {
    "h": 1,
    "w": 18,
    "x": 0,
    "y": 14
  },
  "id": 12,
  "panels": [],
  "title": "row2",
  "type": "row"

I modified 'w’value from 24 to 18.

‘Save changes’ is is Succeed. But, Actually not changed.