String formatting of column value React Table

Question

I am using react table V6. I have data which are shows in table as uppercase string. I want to do formation and display into capitalized format. Here is react table:

 <ReactTable 
 filterable
          data={items}
          columns={[{
              Header: "ID",
              accessor: "id",
            },{
              Header: "Sale Status",
              accessor: "sale_status",
              style :{
                'text-transform':'capitalized'
              }  
            },    
    ]} />

in Sales status data display as DESIGN_CONFIRMATION I want to display as Design Confirmation. Please give me suggesion