What is this button for?
What does it do?
Why should I not click it?
Why put a metaphoric "Big Red Button" in the mod settings?!

Answer

Well, I can give you an option that I found in the settings that might be it ;)

" {
type = "bool-setting",
name = "princessorio",
setting_type = "startup",
default_value = false,
order = "zzz",
},

}
)"

as I don't think it's the demonic logo, can't open it right now though because I am crashing. (Sorry if this is wrong formatting)

If your game crashes, then update the mod.
P.S. it is not only the logo;)

If your game crashes, then update the mod.
P.S. it is not only the logo;)

I will look further later!