hello!i have a composite with plasterbord in outside and inside and an insulation between. whats the best practice to wrap the plasterboard around the open side?

hello!as you can see in the printscreens i have a stone wall in the outer space and a second (stucco) in the inner space but there the material change to stucco. i use a GO in order to have the stone fill, but i dont know hot to make visible the stucco material.Also the stuc...