I personally recommend the color 233, 218, 218 with the material set to Glass, the reflectance to about 0.75 and the transparency between 0.85 to 0.90 .
as long as you’re goin for at least some realism i think there should be more structural stuff to this window, because giant panes of glass usually dont exist like that
all depends on your style, but try adding columns/pillars or metal trusses, beams etc
glass is cool but it’s not that interesting to look at when the entire wall is made of it
as for glass settings, i usually use either metal or glass material with between 0.5 and 0.7 transparency. the color can vary depending on how bright you want stuff behind it to look, and also i would recommend turning CastShadow off if you’re gonna use shadowmap or future lighting