IOS 15 has introduced a redesigned Safari interface that places the address bar at the bottom of the screen. If you prefer to keep it at the top of the screen - like most web browsers - this can easily change.
See also: How to enable pop-ups in Safari on Mac
There are several benefits to having an address bar at the bottom. First, it is easier to move with one hand on a large screen. Second, it puts all the browser controls in one place. If you are not yet convinced to try it, we can not push you but we would recommend it.
First, open the Settings app from the Home screen.
Scroll down and select "Safari".
Go to the "Settings" section and go to the "Single Tab".
Here you go! The address bar is at the back of the top of the screen and the other browser controls are still at the bottom.
Regardless of the interface you prefer, the same volume of content is visible, so it's just a matter of what you find most convenient. THE Apple of course it seems to keep making changes and adding features to Safari.
Source of information: howtogeek.com