what you are seeing is still the HA frontend and more than likely the webview instance of chrome OS may not be up to date and I don’t think you can update it. Not much the app can do here as we do not control the HA frontend.
my chromebook has full access to the Google Playstore and there the Home Assistant app is available and now working.
If you dont have the Playstore, try F-Droid. On my smartphone, i find there the Home Assistant app too.
Thanks Frank. I am trying to convert a Microsoft Surface Pro 3, which is where the issue is. I used Chrome OS Flex which does not have the PlayStore. I am now trying Chromium,