Is it possible to make a map without an overlay?

[Kapurin 0]

I don't understand how the overlay system works, and I don't really need it. Is there a way to disable it when creating a map?

[Łukasz Jakowski 13,374]

Yes, paste this:
 

{
	Overlay: [
		
	],
	
	Age_of_History: Overlay
}