Get/Set the number of left FixedColumns.
Please note - this property requires the FixedColumns extension for DataTables.
This method is either a Getter or a Setter for the number of columns that are fixed to the left of the table. If no argument is supplied then the method acts as a Getter. If an argument is provided then that value is set as the new number of columns to be fixed to the left and the table is updated.
Getter for the number of columns fixed to the left.
The number of columns that are fixed to the left.