Because there’s a whole load of avionics, radar stuff, and other flight systems in the nose. There’s no room for a window.
Secondly they don’t need to see down there as all that aforementioned instrumentation provides them with all the situational awareness that they need.
Edit: here’s a link
https://blog.klm.com/hidden-nose-aircraft/#:~:text=The%20Weather%20Radar%2C%20which%20measures,detect%20unpleasant%20weather%20conditions%20ahead.
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