Composure - can't toggle layer element visibility

On some levels composure layer element visibility seems untogglable. Any idea what’s the requirement for it?

To reproduce it you can create a new level from Basic preset → open Composure Compositing window → Create New Comp → RMB on it → Add Layer Element → CG Layer → Try to toggle new CG Layer.

Tried to assign a layer with elements etc, but composure layer still appears to be disabled.