I have a document library with dozens of folders and hundreds of documents. I type a search term in and press enter. On the results page, I select an item. The main menu bar appears with the standard choices: Open, Share, Copy link, Download, Delete, Move to, Copy to, Rename, and ***. But Flow does not appear on the menu. I exit the search page, browse and select a file, and the Flow menu is available. In Library Settings > Advanced Settings > List experience "New experience" is selected. The Flow is manually triggered "For a selected file".