Preview mode
Preview mode in Rails Builder enables you to visualize how a layout will look in the TV app. This is particularly useful when you’ve created a new layout or made changes to an existing one.
To preview a layout:
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Click the Preview button at the top right of the layout screen.
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Select a device format using the tabs at the top of the screen:
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Monitor
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Tablet
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Phone Landscape
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Phone Portrait
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To close the preview and return to the Rails Builder layout screen, click the blue Layout button at the top right of the screen.