With the classic apps you could have multiple lists on one tab and there would only be one search bar at the top which would search all the lists.
With the new apps the search is placed above the table and you get a new search bar with each table.
It would be amazing to have one tab search bar that shows results for all tables on the page.
Voted. I wish this was a feature in the new Glide Apps as well.
Bumping this up the timeline 
Adding to this request the option to define which data is included in the search.
For example just the item title or description fields etc.
@david Is defining which data columns are included in the search criteria in the works?
Current search function on data grids and tables isn’t very helpful when dealing with a lot of data.