Chartjs-ChartJS multichart graph not showing correctly legends

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If the usePointstyle flag is set in the legend it defaults to the circle. In V2 this is not configurable for bar charts so you have 2 options

You can switch to a html legend and style that. Or you can update to chart.js version 3 where you can configure it for bar charts:

var options = {
  type: 'bar',
  data: {
    labels: ["Red", "Blue", "Yellow", "Green", "Purple", "Orange"],
    datasets: [{
        label: '# of Votes',
        data: [12, 19, 3, 5, 2, 3],
        backgroundColor: 'yellow'
      },
      {
        label: '# of Points',
        data: [7, 11, 5, 8, 3, 7],
        backgroundColor: 'pink',
        pointStyle: 'rect'
      }
    ]
  },
  options: {
    plugins: {
      legend: {
        labels: {
          usePointStyle: true
        }
      }
    }
  }
}

var ctx = document.getElementById('chartJSContainer').getContext('2d');
new Chart(ctx, options);
<body>
  <canvas id="chartJSContainer" width="600" height="400"></canvas>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/3.5.0/chart.js"></script>
</body>

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