Moving folders · How moving folders works
Does Storage Studio need Full Disk Access to move folders?
Short answer: For protected folders, yes. macOS keeps Documents, Desktop, Downloads and your Library off-limits to apps without Full Disk Access. Grant it from Settings → Advanced → Permissions; Storage Studio uses it only to find, measure and move space.
For folders macOS protects, yes. Documents, Desktop, Downloads and your Library are off-limits to every app without Full Disk Access, so without it Storage Studio can't measure or move them, and your rules quietly find nothing there.
Grant it in Settings → Advanced → Permissions, which walks you through System Settings → Privacy & Security → Full Disk Access. Storage Studio only uses it to find, measure and move space — it doesn't read your documents' contents. Folders outside those protected areas can be moved without it.
See privacy & safety.