Url on PWA when navigating

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Hi, I have Progressive Web App(PWA) using MVC. I have tested so far where my service worker is working(able to work offline), manifest.json has no problem(able to add to homescreen). But one thing I find weird is I am seeing URL on top of the page when I am navigating. Once add to homescreen, I have no problem loading the app with home page do not have URL on top. But when I navigate to other page, the URL shows up.
Below is my manifest.json file:

{
    "name": "myPWA",
    "short_name": "myPWA",
      "icons": [{
        "src": "/images/icons/android-chrome-36x36.png",
        "sizes": "36x36",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-48x48.png",
        "sizes": "48x48",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-72x72.png",
        "sizes": "72x72",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-96x96.png",
        "sizes": "96x96",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-144x144.png",
        "sizes": "144x144",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-192x192.png",
        "sizes": "192x192",
        "type": "image/png"
      }, {
        "src": "/images/icons/android-chrome-256x256.png",
        "sizes": "256x256",
        "type": "image/png"
      },{
        "src": "/images/icons/android-chrome-512x512.png",
        "sizes": "512x512",
        "type": "image/png"
      }],
    "start_url": "/home/index",
    "display": "standalone",
    "background_color": "white",
    "theme_color": "white",
    "orientation": "portrait"
  }

Any help would be appreciated.

What I have tried:

1.Tried to look for explanation online but seems none article is related to my case here.