Answers for "width of datatable"

datatables change width of columns

$('#example').dataTable( {
  "autoWidth": false, // might need this
  "columns": [
    { "width": "20%" },
    null, // automatically calculates
    null  // remaining width
  ]
} );

datatables change width of columns

Javascript
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$('#example').dataTable( {
  "columnDefs": [
    { "width": "20%", "targets": 0 }
  ]
} );