How do I change the default paper size detected by the HP DeskJet GT 5820?
To change the default paper size, open the embedded web server (EWS). Navigate to Settings > Preferences > Tray and Paper Management. Select your desired option from the drop-down menu and click Apply. (Page 21)
From the official HP Deskjet GT 5820 All-in-One Printer manual, page 21
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