I opened my project and almost all of my blueprints are gone in the folders. Is there any fix??
If you haven’t already, try restarting. Next, I’d poke around the file explorer and see if the blueprints are hiding somewhere. The next candidate would be the recycle bin.
While this is likely unhelpful: Unreal definitely does some wonky stuff sometimes, periodically zipping a your project to a external drive is always a good idea in case crap like this happens.