Options Duplicate Files / Folders page indicates the folders on your drives which must be processed by the System Cleaner's Duplicate File Finder.
You can simply select the option All Folders to ensure the maximal duplicates search scope. Alternatively, you can select the option Folders Named to only consider the folders listed below.
To manage the specific folders list, please use the buttons below it. The wild characters * and ? can be used in the folder name to define a set of folders. Make sure that check marks are placed in the boxes next to the folders you want to be searched for duplicates.