>>765046people usually set up the passenger side with a captain seat. it adds more room to the living space, since the seats can be used to sit and such. it's more important and more common when you have multiple people in a van, pic related
here's a better alternative to the steel divider or blackout curtain: electronic tinted windows. you can black out (less than 1% of light gets through) your front windows at the touch of a button, so you can use all the space in your van without people being able to see you watching your animes. unlike window curtains, it doesn't broadcast that you are a vanhobo