Połącz 2 dane w kolumnie

function fullNameGetter(params) {
    return params.data.Title + ' ' + params.data.FirstName + ' ' + params.data.MiddleName + ' ' + params.data.LastName;
  }

.....
    {
      headerName: 'Full Name',
      field: 'Title&FirstName&MiddleName&LastName',
      filter: true,
      width: 225,
      valueGetter: fullNameGetter,
    },
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