It IS making the npc invisible. That's the same as disabling the event.
Your first page is the ONLY one that should have no conditions (and even then, sometimes, the first page will have conditions too, if you don't want it to be there by default). All the other pages should have conditions.
What turns on switch 1?
Your first page is the ONLY one that should have no conditions (and even then, sometimes, the first page will have conditions too, if you don't want it to be there by default). All the other pages should have conditions.
What turns on switch 1?

