Tell users which screen orientation works best – Google PRINCIPLES OF MOBILE SITE DESIGN: DELIGHT USERS AND DRIVE CONVERSIONS User Manual

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22. TELL USERS WHICH

SCREEN ORIENTATION

WORKS BEST

Study participants tended to stay in the same
screen orientation until something prompted them
to switch, like trying to read small type or watch a
video. Either design for both landscape and portrait,
or encourage users to switch to the optimal screen
orientation - but make sure your important calls-
to-action can be completed even if they ignore the
suggestion to switch.

Sample screen for illustration only.

Key Takeaway
Communicate to users if your site works

best in a certain orientation, but ensure

your important calls-to-action can be

completed regardless of orientation.