Use an individual Default control when available. This preserves unrelated preferences and makes the cause easier to identify.
Record scan thresholds, ignore paths, menu choices, and online-service access states before a broader reset.
Resetting preferences does not:
- Restore removed files.
- Revoke Full Disk Access.
- Remove every macOS Login Item.
- Delete Home-folder contents.
- Cancel an online request already completed.
After reset, reopen diCleaner and run a new test scan. Recreate only the customizations you still need.