Safari 26 brings a fresh feel to using websites on your iPhone and iPad by...

https://bizzmarkblog.com/why-does-my-ipad-web-app-feel-different-from-the-same-site-in-safari-tabs/

Safari 26 brings a fresh feel to using websites on your iPhone and iPad by making them behave more like apps. When you add a site to your Home Screen, it now opens with minimal browser interface, letting the site take center stage