Everyone was pretty outraged over the fact that Season 1-19 had been shifted to Widescreen from their original 4:3 aspect ratio, causing some pretty crucial parts of episodes to be cropped out as well as having characters stretched.
Disney has acknowledged the issue and said that different viewing options will be provided in early 2020.
“We presented “The Simpsons” in 16:9 aspect ratio at launch in order to guarantee visual quality and consistency across all 30 seasons. Over time, Disney+ will roll out new features and additional viewing options. As part of this, in early 2020, Disney+ will make the first 19 seasons (and some episodes from Season 20) of “The Simpsons” available in their original 4:3 aspect ratio, giving subscribers a choice of how they prefer to view the popular series.”
All the classic Simpsons episodes on Disney+ are in cropped widescreen format — this means you miss out on tons of great visual jokes, like how Duff, Duff Lite and Duff Dry all come from the same tube. pic.twitter.com/cTy9adulFl