How to lock episodes

Hello, this is a second time I post something in here.

So I was still playing with the Umineko project and I ended up unlocking all episodes so I could try if the ep 5 is running well. But now I would like to lock the episodes (with tea party/????) again, is it possible or do I have to make a fresh install again?

Thanks!

Hello, there is a "Reset game option in settings

Thanks alot!