With the two toggle options for the quick search feature, i.e., search the entire database and search the file list, it makes more efficient to find images in a large database.
The toggle option is positioned to the right of the quick search bar.
When making a search through the entire database, e.g., animal, you will receive a very large list. You can then choose the search the file list toggle option to search with keyword or category within the group, further narrowing down the search result.
For a demonstration of this feature, please watch this video tutorial at 18:48 mark, presenting this feature with an example.