I often re-organize files and folders to help me remember there purpose.  Over several years, as files are synced between HDD on multiple PC's and my flash drive, it is getting harder to determine which files to keep or delete.  Deleting all missing files from source or target, unfortunately I end up loosing some files. 1) Want to scan only the Source, or Target, for duplicates/repeated.
If it is not possible to display only source or Target, then  add a check box to show only Repeated files when there are more than 2.