Safari 26 lets you use many websites like apps on your iPhone and iPad. When...

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

Safari 26 lets you use many websites like apps on your iPhone and iPad. When you add a site to your Home Screen, it opens without the usual browser bars and controls. This ‘Open as Web App’ behavior makes the site feel smoother and more focused