New search box in top navigation bar is good but... Please leave it only for search the content on the site and create separate search box in list/libraries, in their own navigation bar!!! Search box, where search changing between search the site and list/lib is very confusing for users and for power users too!!! Show the search box in lists and libraries the same liken in list connected to Teams. I think it is only one good solution. Thanks
Adrian Goneau commented
I second this. An, it would be especially useful to have the option of a search box within a list web part, when embedding list web parts on a page, so that users can filter the list that is being displayed. Classic SP has this ability and it works great! Take it a step further and make the list autofilter based on what is being typed in the box!