To make your project content scale up to different screen sizes (both bigger and smaller) enable the Scale Layout setting. Keep in mind that only the content within the guide frame will be scaled. To limit the width of scaling, enter your desired numeric value (between 1024px and 8400px).
Projects with Scale Layout enabled are automatically scaled in Editor mode. This makes the design process easier and guarantees your project will look the same during editing and after publication.
Note: This setting applies only to the Desktop layout. In Firefox, Scale Layout won't be visible in Editor mode.