To create a full-screen ratio for your video in Alight Motion, follow these steps: Open your project and go to the composition settings. Set the aspect ratio to match the desired full-screen dimensions, such as 16:9 for widescreen. Ensure that your content alight motion full screen ratio is properly aligned and scaled to fit within these dimensions. You can adjust the position and size of your layers to ensure they fill the entire screen without any black bars or cropping. This will help you create a seamless, full-screen video experience.