Freeing up space · What's Using Space (Storage Inspector)
What does the ACTIONABLE badge mean in What's Using Space?
Short answer: ACTIONABLE marks items Storage Studio can safely move to your fast drive or clean. Rows without it are information only and are left alone, like protected system or mail data.
It marks items Storage Studio's rules can safely reach — things it can move to your fast drive or clean for you. Rows without it are shown for information only and left alone, for example protected system data or an app's active mail.
Actionable rows that are big enough to be worth it get a Move to fast drive button; the footer also reminds you that actionable rows can be cleaned through Free Up Space.