Troubleshooting & messages · Free space and clean-up messages
What does "You stopped this. Nothing was removed — this is a simulation" mean?
Short answer: It was a preview that only shows what would happen, so stopping it changed nothing — no files were removed or moved.
You were running a preview (a simulation) that only works out what would happen. Stopping it changes nothing — no files were removed or moved, because a simulation never touches files.
Run it for real when you're happy with what it showed.