How can I make the top of the angled flanged to be the same height as the side flange? I tried to change from "Blind" to "up to vertex" and this is what I get. Since the flange is at an angle I cannot use the height of the side flange value. I can get it by trial and error but I'm sure there is a proper way to do this.

I don't do a lot of sheet metal, but one option would be a little trigonometry and an equation.