Hi, I'm not sure that we can integrate the "Render-Safe Frame" with the VFB. However, there are some other options to achieve a similar effect:
1. You can set the same image size in the "Document" > "Creative Imaging" > "PhotoRendering Settings" dialog (which configures the render-safe frame) and in the Corona rendering dialog (which defines what Corona actually renders).
2. You can also see the rendered frame directly in the VFB if you turn on interactive rendering.
