Vue CLI not re-rendering

I am facing this issue…

I am working on a project using Flask and Vue, and I am having trouble with the front end. I am using Vue Cli with Babel and router packages.

Now I am trying to make a vue view file.

1. I start my server.

2. make changes (e.g. changing some text, style, etc.)

3. I am not able to see the changes without stopping the server and starting again manually. On average, it takes 5 to 20 minutes.

Is there a way for the Vue server to automatically update itself, as I code?

I am new to Vue, and this is for a college project. I am told that the server detects changes automatically and updates them, but that is not happening in my case.

I am sharing my config files here.

App.vue:

<template>
  <router-view/>
</template>

<style scoped>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
}

nav {
  padding: 30px;
}

nav a {
  font-weight: bold;
  color: #2c3e50;
}

nav a.router-link-exact-active {
  color: #42b983;
}
</style>

main.js:

import { createApp } from 'vue'
import App from './App.vue'
import router from './router'

createApp(App).use(router).mount('#app')

babel.config.js:

module.exports = {
  presets: [
    '@vue/cli-plugin-babel/preset'
  ]
}

jsconfig.json
{
  "compilerOptions": {
    "target": "es5",
    "module": "esnext",
    "baseUrl": "./",
    "moduleResolution": "node",
    "paths": {
      "@/*": [
        "src/*"
      ]
    },
    "lib": [
      "esnext",
      "dom",
      "dom.iterable",
      "scripthost"
    ]
  }
}

pacakge.json:

`{
  "name": "frontend",
  "version": "0.1.0",
  "private": true,
  "scripts": {
    "serve": "vue-cli-service serve",
    "build": "vue-cli-service build"
  },
  "dependencies": {
    "core-js": "^3.8.3",
    "vue": "^3.2.13",
    "vue-router": "^4.0.3"
  },
  "devDependencies": {
    "@vue/cli-plugin-babel": "~5.0.0",
    "@vue/cli-plugin-router": "~5.0.0",
    "@vue/cli-service": "~5.0.0"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not dead",
    "not ie 11"
  ]
}
`

vue.config.js:

const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
  transpileDependencies: true
})

I have created 3+ vue projects, but the result is the same, I am not sure what other dependencies to install.

Please help me out, thanks!