Assets referenced in memory still after restarting editor & Can't Be Deleted?

I’m trying to delete some old level maps & some folders, but even after restarting the editor on a blank level, I’m being told the assets are still being referenced in memory somehow? Could someone explain what is going on and how to fix this, please? I don’t want to possibly ruin anything by forcing to delete them, it doesn’t usually work if I try to force delete something anyway and will just crash the editor. Thank you! :slight_smile:

I figured out how to fix it for levels by opening the levels and deleting everything in them and then saving them, however I don’t know how to fix it for other assets for instance, I try to delete what looks like an empty folder(which I’ve already fixed up redirectors in) and it won’t delete it, there isn’t even any error message.