Finding things in Finder · Reveal in Finder across the app
How do I show an item from What's Using Space in Finder?
Short answer: Click the small folder icon (Reveal in Finder) on the row. It works on the main list, folders under Biggest on this disk, and the Relocated panel, where it shows the copy on your fast drive.
Click the small folder icon (Reveal in Finder) on the row. Finder opens with that item selected, so you can look inside before deciding what to do.
This works throughout What's Using Space: on rows in the main list, on folders you've drilled into under Biggest on this disk, and on rows in the Relocated panel — where it shows the copy on your fast drive.
Revealing never changes anything. To act, use the row's own buttons, such as Move to fast drive.
See What's Using Space.