Here is the main screen where you can specify the search criteria: where you want to look for duplicate files and how you want to find them.

Duplicate Cleaner has found some duplicate files. Here it displays the summary, detailing what has been found along with the time taken to search.  Duplicate files are arranged into Groups, each group containing alike files.

The Selection Assistant.  This tool helps you with the task of selecting files to delete or move.

The Delete, Move and Hardlink window.