Set your browser to request the mobile version of the site and reload the page to enjoy immersive mode

Hi,
Right now, I’m testing the image tracking feature in UniversalAR + A-Frame.

When I ran the simple image tracking application on my iPhone 6S (iOS14.4, Safari 14.0.3), I got the following message

Set your browser to request the mobile version of the site and reload the page to enjoy immersive mode.

The following is a sample.
https://webxr.run/A93gEpvW3dDRx

What happens when this happens? Is there a workaround?
Also, please let me know how to customize such a message if possible. Questions about customizing messages are also asked below.
https://forum.zap.works/t/how-to-customize-the-motion-sensor-and-camera-permissions-dialog/8266

Best regards.

Sadao Tokuyama
tokuyama@1planet.co.jp
https://1planet.co.jp/

I solved the dialog by turning off “Show Desktop Websites” in Safari’s settings.
Now I just need to know how to customize the message in this dialog.