The place of documentation is here . You can specify the width in the parameters of the viewGridRow method. You call the method directly, like here
onSelectRow: function (id) { $(this).jqGrid('viewGridRow', id, {width: 500}); }
or you can use the View icon in the navigation bar:
$("#list").jqGrid('navGrid', '#pager', {add: false, edit: false, del: false, search: false, view: true}, {}, {}, {}, {}, {width: 500});
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