Seems as if my Fold is one of those that doesn't fully open flat. It's not as extreme as the examples out there I've seen, but it is noticeable. It goes flat if I bend it back slightly after opening. I have no idea how to measure the angle of opening / whether it is actually a defect. Apparently it is an adhesive issue? Why is it always the glue 🤣. All the way back to the iPhone 5, the yellow screens were allegedly caused by glue issues.