I am able get results when I am searching in the root folder of the library, but when I try to search inside a folder in the same library, the search does not work as expected. (In Modern UI of SharePoint online document library)
for example- If I types a keyword in the search box in the top left-hand corner, then clicks "see more results", get the message "no items match your search". how ever matching documents already there in library inside folder.
Library has exceeded threshold limit. having around 70K files.