How to customized the Screen of the phone. By default 320x 505. Need 420 x 780
You do not / you can not. You can use Tablet or monitor sizes if you need more space.
The designer only provides a representation of your app layout.
Use the companion app to see how your app looks on a real device, and ensure you are working with responsive sizing, using screen percentages for width and height of your components.
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