Please turn OFF auto-rotate
(lock your screen to portrait).
iPhone: swipe down from the top-right corner and tap the Portrait Orientation Lock icon.
Android: swipe down from the top and turn off Auto-rotate.
Then hold your phone sideways (turned left) to view the catalog.
Please lock your screen to portrait,
then hold your phone sideways.
iPhone: Control Center → Portrait Orientation Lock.
Android: Quick Settings → turn off Auto-rotate.