• English: Child writing on paper while adult off-screen works on a laptop in Outlook.
  • Dutch: Kind schrijft op papier terwijl volwassene buiten beeld op een laptop in Outlook werkt.
See: https://www.proz.com/kudoz/english-to-dutch/media-multimedia/7191133-off-screen.html
"off-screen" is here being used synonymously with:  
• out of sight
• out of the picture
• not visible
• out of view