Apps · Offloading and restoring apps
How do I restore an app I offloaded?
Short answer: Open Apps → Offloaded and click Restore. The app and its data are copied back exactly where they were. The fast drive must be connected.
Open the Apps window, go to the Offloaded tab, and click Restore on the app. Storage Studio copies the app and its data back to exactly where they were, so it opens as you left it.
Your fast drive must be connected and your Mac needs room for the app and its data. If a copy of the app is already installed, Restore stops and explains rather than overwriting it — see why restore can refuse.