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Showing content from https://developers.google.com/maps/documentation/javascript/examples/polyline-remove below:

Removing Polylines | Maps JavaScript API

TypeScript

// This example adds a UI control allowing users to remove the polyline from the
// map.

let flightPath: google.maps.Polyline;
let map: google.maps.Map;

function initMap(): void {
  map = new google.maps.Map(document.getElementById("map") as HTMLElement, {
    zoom: 3,
    center: { lat: 0, lng: -180 },
    mapTypeId: "terrain",
  });

  const flightPathCoordinates: google.maps.LatLngLiteral[] = [
    { lat: 37.772, lng: -122.214 },
    { lat: 21.291, lng: -157.821 },
    { lat: -18.142, lng: 178.431 },
    { lat: -27.467, lng: 153.027 },
  ];

  flightPath = new google.maps.Polyline({
    path: flightPathCoordinates,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2,
  });

  // add event listener for click event
  document.getElementById("add-line")!.addEventListener("click", addLine);
  document.getElementById("remove-line")!.addEventListener("click", removeLine);

  // initialize with line
  addLine();
}

function addLine(): void {
  flightPath.setMap(map);
}

function removeLine(): void {
  flightPath.setMap(null);
}

declare global {
  interface Window {
    initMap: () => void;
  }
}
window.initMap = initMap;

Note: Read the guide on using TypeScript and Google Maps. JavaScript

// This example adds a UI control allowing users to remove the polyline from the
// map.
let flightPath;
let map;

function initMap() {
  map = new google.maps.Map(document.getElementById("map"), {
    zoom: 3,
    center: { lat: 0, lng: -180 },
    mapTypeId: "terrain",
  });

  const flightPathCoordinates = [
    { lat: 37.772, lng: -122.214 },
    { lat: 21.291, lng: -157.821 },
    { lat: -18.142, lng: 178.431 },
    { lat: -27.467, lng: 153.027 },
  ];

  flightPath = new google.maps.Polyline({
    path: flightPathCoordinates,
    strokeColor: "#FF0000",
    strokeOpacity: 1.0,
    strokeWeight: 2,
  });
  // add event listener for click event
  document.getElementById("add-line").addEventListener("click", addLine);
  document.getElementById("remove-line").addEventListener("click", removeLine);
  // initialize with line
  addLine();
}

function addLine() {
  flightPath.setMap(map);
}

function removeLine() {
  flightPath.setMap(null);
}

window.initMap = initMap;

Note: The JavaScript is compiled from the TypeScript snippet. CSS

/* 
 * Always set the map height explicitly to define the size of the div element
 * that contains the map. 
 */
#map {
  height: 100%;
}

/* 
 * Optional: Makes the sample page fill the window. 
 */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

#floating-panel {
  position: absolute;
  top: 10px;
  left: 25%;
  z-index: 5;
  background-color: #fff;
  padding: 5px;
  border: 1px solid #999;
  text-align: center;
  font-family: "Roboto", "sans-serif";
  line-height: 30px;
  padding-left: 10px;
}

HTML

<html>
  <head>
    <title>Removing Polylines</title>

    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script type="module" src="./index.js"></script>
  </head>
  <body>
    <div id="floating-panel">
      <input id="remove-line" type="button" value="Remove line" />
      <input id="add-line" type="button" value="Restore line" />
    </div>
    <div id="map"></div>

    <!-- 
      The `defer` attribute causes the script to execute after the full HTML
      document has been parsed. For non-blocking uses, avoiding race conditions,
      and consistent behavior across browsers, consider loading using Promises. See
      https://developers.google.com/maps/documentation/javascript/load-maps-js-api
      for more information.
      -->
    <script
      src="https://maps.googleapis.com/maps/api/js?key=AIzaSyB41DRUbKWJHPxaFjMAwdrzWzbVKartNGg&callback=initMap&v=weekly"
      defer
    ></script>
  </body>
</html>

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