hiding columns while generating pdf export button

Ashok Darbar

Hide columns
I've datatable table which have n no. of columns, columns generating dynamically not fixed
but while having 9+ columns then, generated pdf showing only 8 columns or which best to fit in screen
now i want all columns of table in pdf

My code as below

 {
              "extend": "pdf",
              "text": "<i class='fa fa-file-pdf-o bigger-110 red'></i> <span class='hidden' data-bind='text:act.LabelName.ExportToPDF'></span>",
              "className": "btn btn-white btn-primary btn-bold", 
          },