Window glass material see through on the edges?

I am trying to make a window pane for my window and when I apply the glass material I made to a non plane BSP shape it makes the edges see through. There is no option to make a plane shape (flat) from BSP geometry in ue5.1 that I can see which might fix this problem. Once before I was able to make a flat shape with BSP geometry but when I converted it to a static mesh the plane with the glass material just disappears afterward.

So I see that using brush type option “sheet builder” I assume is the only way to make a flat plane BSP shape in ue5.1. So I did that and it fixed the edges being see through but when you convert it to static mesh it completely disappears like I mentioned before for some reason.