Try opening Settings, entering "search" in the search box, then choose "Search Permissions and history" from the returned results.
When the Search dialog opens, choose the Searching Windows pane then select the Classic option.
I'm really not certain this will get the result you're looking for, though. As the enhanced search interface as of Version 1903 does not look like (regardless of tweaking) the earlier one. But it should get rid of some of what you're complaining about, as I have never had a single pop up using Classic.