[Solved]-How to pass percentage value to width to React data grid column-Reactjs

To pass with as percentage in a react component you just need to do the following width='100%'.

To make a given column resizable, set column.resizable = true.

If you need to know when a column has been resized, use the onColumnResize prop. This will be triggered when a column is resized and will report the column index and its new width.

These can be saved on the back-end and used to restore column widths when the component is initialized, by setting width key in each column.

pass resizable:true which you want to resize like below.

this._columns = [
  {
    key: 'id',
    name: 'ID',
    resizable: true,
    width: 40
  },
  {
    key: 'task',
    name: 'Title',
    resizable: true
  }]

refer here for more info

I know maybe it is late but you can achieve this by setting the value as string

const columns = [
  {
    key: 'Month',
    name: 'Mes',
    width: '50%',
  },
  {
    key: 'Tickets',
    name: 'Tickets',
    width: '10%',
  },
 ];

Hope it helps