iPhone Mirroring in macOS Golden Gate gives us a clue about what the first folding iPhone will be like. For the first time, you can resize the window to any arbitrary size. That means you can stretch the screen to the rumored dimensions of Apple’s upcoming foldable and see how your favorite apps will look and work.
After all, it’s going to be an unusual iPhone. The unfolded inner screen will be roughly iPad mini-size, with an outer screen that’s much shorter and wider than any iPhone made in the last 15 years.
I took some screenshots of various Apple apps to demonstrate what the folding iPhone’s user interface will look like.

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