Duplicate files · Scanning and Auto-scan
Where can I see whether the duplicate finder is running?
Short answer: Each source's status line in the Duplicates window shows progress, the last check time and any waiting reason. For an overview, see Duplicate file finder in Preferences → Services; the Home Duplicates card also shows the latest summary.
Two places. In the Duplicates window, the status line under each source shows live progress while it scans, or — when it's idle — when it last checked and why it's waiting, if it is.
For an overview, open Preferences → Services and look for Duplicate file finder, which shows whether the background finder is healthy alongside Storage Studio's other services. The Duplicates card on Home also updates its summary once a scan has found something.