How do I tell what layout is playing?

Hi.

Simple question I think (hopefully a simple answer).

Is there way to tell during gameplay which layout is active and is currently playing?

I'm trying to create a kind of "smart" menu system using only one event sheet and I want certain buttons in the menu to be either active or inactive depending on what layout is playing. But I'm not sure how to go about telling it which layout it's in.

Thanks!

https://www.scirra.com/manual/126/system-expressions

System.LayoutName

Thank you!