Shut down the passenger seat completely?

Hello dear forum members! I’m new here, and yes I will introduce the Dickelch here soon, as soon as the weather allows some nice photos again. I’ve had the XC90 for two weeks and wanted to check if I can transport an overlong package if I change the passenger seat. According to RTFM this should be quite easy and the headrest of the passenger seat should disappear under the glove compartment.(So I also knew this from my V40) Unfortunately the Beif Do not push your seat far enough to the rear so that the headrest would fit even close to the dashboard. Is this now due to the electrically adjustable passenger seat, or do the headrests with RSE build higher? How is this for you? Can the seat be completely folded down – or is this a ‘luxury problem’? Just for the sake of completeness: XC90 D5 Executive, MJ2012 Thank you very much