If you want to get the classic detailed view, you can still press the tabs icon available in the left corner of the bottom menu, along with the Bookmarks, Share Extensions and Back buttons. Do mind, that if you begin to browse the current tab, and scroll vertically, both address bar, tabs scrubber and bottom menu disappear and allow the tab view to expand and display more information.
Tip: To bring back the open tabs scrubber you have to scroll all the way down until you reach the bottom of the displayed web page or attempt to return back to the top of the tab, by performing two back-to-back swipe-down gestures.
Fact: The new iOS 11 tabs scrubber also automatically hides when you flip your iPhone back to portrait view. This new addition is a great way to switch between Safari tabs without leaving the current page.