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Customize an app by changing its screen size and orientation.
Under App settings, click or tap Screen size + orientation.
In the Orientation list, click or tap Portrait or Landscape.
(Tablet apps only) Under Aspect ratio, click or tap the ratio that matches the target device for this app.
Under Lock aspect ratio, specify either On or Off.
If you lock the aspect ratio, the app will retain the appropriate aspect ratio for a phone. If the app is running on another kind of device, the app will display incorrectly and may show unwanted results. If you unlock the aspect ratio, the app will adjust to the aspect ratio of the device on which it's running.
Under Lock orientation, specify either On or Off.
If you lock the app's orientation, the app will retain the orientation that you specify. If the app is running on a device for which the screen is in a different orientation, the app will display incorrectly and may show unwanted results. If you unlock the app's orientation, it will adjust to the screen orientation of the device on which it's running.
Select Apply to save your changes.
On the File menu, select Save to republish your app with the new settings.