[Chartjs]-Chart.js Polar Area Chart is not scale right

in options try adding maintainAspectRatio: false, so that it does not try and keep a nice square which pushes the actual chart to a small size due to the large amount of labels.

options: {
    maintainAspectRatio: false,
    scale: {
      reverse: false,
      ticks: {
        min: 20,
        max: 90
      }
    }
  }