Η Apple let the new design of the Safari tab line in iPadOS 15, disabled by default, but is pre-installed when upgrading to iPadOS 15 or later. If you want to experiment with the new "compact" tab bar design, it's easy to turn it on in Settings and you'll see below.
First, open them Settings pressing the gray gear icon.
In Settings, press “Safari”On the sideline.
In Safari settings, go to “Tabs”And then select” Compact Tab Bar Until a check mark appears below it.
See also: How to enable pop-ups in Safari on Mac
Then launch Safari and open multiple sites at once. Previously, with the “Separate tab line", You would see an exclusive tab bar just below the address toolbar. Now, with the option "Compact Tab Bar", The toolbar at the top of the screen takes up less space. This is because the tab bar has been merged into the address bar.
To view or edit the current URL in "Compact Tab Bar Bar Mode", press the current tab button and it will expand to an address bar. To open a new search box to enter a search term or a new web address, press the plus (“+”) button on the right side of the tab bar.
If you change your mind and want to go back to the old tab bar style, just open Settings again and go to Safari, then select "Separate tab bar" in the Tabs section. You can make a similar change to iPhone if you are not happy with the new Safari design in iOS 15.