Previewing allows you to see what a single user 'home' folder will look like after the copy has finished.
To preview, select a suitable source user 'home' folder (1) and press the "HERE" button (2).
The preview function copies the specified folder to a temporary working folder and depending on the amount of content, should be complete in a few moments.
The file list on the left are the files and folders from the sample source path (3). The file list on the right (4) contain the source files and folders after they have been copied using your criteria set throughout HFMT. As can be seen from the folder totals above, several folders have been excluded from the copy as they are not present in the destination folder.