Default shader setup may not work correctly everywhere and for all engines, glass rendering depends on many external factors like environment, lighting conditions and so on.
For Eevee, take a look at
For Cycles, take a look at Lech Sokolowski (Chocofur) bconf 2019 tips.
Window glass are separated objects so you may tweek Ray visibility.
For Cycles glass rendering you may also take a look at Vilem Duha bconf 2019 speach.
