i'm confused, i have never had the issue you are describing. the buildings are only as big as you make them, so if the windows are too high up, it seems like the solution is to just... not make them so high up? changing the player height would be difficult, and moving their eyes above their head where the top of their hitbox is (for hats) would be weird...
the default door is 2 units wide and 4 units tall, a 2x2 window placed 2 units up matches the door and you can see out of it perfectly...
Good afternoon! You were making a mannequin. If you get closer, you don't look into his eyes, but into his chest. That's what I'm talking about. I try to stick to real sizes in my buildings, but as a result, you feel like a dwarf. The block size, in my opinion, is still 0.5 meters. If you make a doorway not 4 blocks, but 3,8 - 3,9, then the character does not pass. But if you look up, you can see that it feels like a plane might fly over there. Maybe I'm wrong, this is my subjective opinion.