Safari 26 on iPhone and iPad helps websites act more like apps by improving...

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

Safari 26 on iPhone and iPad helps websites act more like apps by improving Home Screen behavior. When you add a site to your Home Screen, it now opens in a clean, app-like window without the browser’s address bar