― ∙ In this tutorial, I will show you how to customize the size of a template, or any project, in After Effects. For example, we have our Boxes slide template here. If you open it up, you will see the Main Composition, and we also have a folder called Other Resolutions. Open this up, and you’ll find three pre-set compositions. The original composition size is Full HD: 1920×1080. In case you want a smaller composition, or a different size, you can select one of these. The first one is HD [...].