I like to leave them open after dark until bed time. My wife closes the blinds at dusk (even at home). Yes, we fight about the blinds and I usually lose.
Depends on where neighbors are located. If someone is across from us, the windshield blinds are closed when it gets dark. The awning side windows,blinds are usually open (if good temp) until we go to bed as you can't see thru the windows unless you walk close to the motorhome. Blinds on the opposite slide usually have the day shade down until bed unless the window is open for a breeze.
Usually put the blinds down at night... but angle them so the morning sun comes in. With the blinds angled up like that, an open window provides good fresh air.