File Search tool can be accessed either from the Tools menu or by right-clicking on image node in the Data Explorer / Directory Tree. By using File Search, you can specify, filter, and show the directories and files that you want to see from the images in the current opened case. The File Search results will be populated in a brand new Table Result viewer on the right-hand side.
Currently, Autopsy only supports 4 categories in File Search: Name, Size, Date, and Known Status based search.
To see how to open File Search, click here.
To see how to use File Search, click here.
Here's an example of a File Search window: