Width for the line number column. This property width of the line number column. This property can be set during object creation: let grid = new w2grid({ name: 'grid', show: { lineNumbers: true }, lineNumberWidth: 50, columns : [ { field: 'recid', text: 'ID', size: '50px' }, { field: 'lname', text: 'Last Name', size: '30%' }, { field: 'fname', text: 'First Name', size: '30%' }, { field: 'email', text: 'Email', size: '40%' }, { field: 'sdate', text: 'Start Date', size: '120px' }, { field: 'sdate', text: 'End Date', size: '120px' } ] }); Or any time during run-time: w2ui.grid.lineNumberWidth = 100; w2ui.grid.refresh();