Safe Frame for Videos/Animations

When creating views for an animation, the view on the screen doesn’t match the aspect ratio of the generated video file. I think it would be great to have an option to enable a safe frame view when creating animation views where the view window will adjust the proportions of what you see to match the proportions of the output video or image.

e.g. if the output video is something like a 4:3 aspect ratio, the viewing window would add black bars at the top and bottom or left and right sides of the screen so the user would be viewing a 4:3 ratio while trying to set up views instead of needing to guess where the limits of the frame are for the output.

I’ve attached a side-by-side screenshot to show the comparison between the frame setup process and the output.