You can usually use the Network Browser in the 'Available folders' list - however if this isn't available there are several other ways to add network folders to Duplicate Cleaner's scan list:
Option 1 — Use the Select Folders dialog Right-click on the 'Folders to search' list and select Select Folders. A window will open containing the Windows Network browser, where you can navigate to and select the folder you want to add.
Option 2 — Drag and drop Open Windows File Explorer, navigate to the network folder, and drag it directly into the 'Folders to search' pane in Duplicate Cleaner.
Option 3 — Enter the UNC path manually Type or paste the network UNC path (e.g., \\ServerName\ShareName\Folder) into the box under 'Available folders' to add it to the list.