How can I change the width of columns for the table and I am using responsive = true

Mikadoog

All of my columns are the same size and I would like for them to size for the size of the data in the column or to size manually.
I have
var table = $('#table_id').DataTable({

        responsive: true

            });

I tried to add some code for Column defs before this but it did not like it. Any suggestions?