Measures this screen the way The Books will see it. Nothing is saved or sent anywhere. Gold stripes are areas the phone keeps for itself (camera, status bar, home bar). The dashed line marks the middle of the screen.
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Open Duo check from its Home Screen icon, folded. Tap Try full width.
Look at the right edge: is the striped band showing where the black strip used to be? Take a screenshot.
Unfold it and hold it sideways. Screenshot again. Then turn it upright and screenshot again.
Tap Copy readout and paste it here with the screenshots.
Fold, unfold or rotate and each change shows up here.