Safari 26 on iPhone and iPad helps many websites feel just like apps. When you...

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 many websites feel just like apps. When you add a site to your Home Screen, it launches without the usual browser stuff, giving a clean, full-screen view