Chartjs-Alter width of axes in chart.js v3

here you will find more grid or grid-line-configuration

options: {
  scales: {
    x: {
      grid: {
        borderColor: 'black',
        borderWidth: 4,
      },
    },  
    y: {
      grid: {
        borderColor: 'black',
        borderWidth: 4,
      },
    },
  },
},