Nova Launcher and wallpaper in portrait

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http://forum.xda-developers.com – I installed Nova Launcher and Multipicture Live Wallpaper. I set with this software a 1080p wallpaper and it's perfect, but when I try to rotate my tablet in portrait mode I only see the center of wallpaper, so it's very cropped! How can I solve this problem? Is there a solution? (HowTos)