As you can see the source directory as a whole is not visible you can only edit pages.
It looks like you’re trying to report a bug. If so, the way to do that is via Feedback Assistant. See my Bug Reporting: How and Why? for a lot more info about that process.
Please post your bug number, just for the record.
FWIW, I’m seeing the same issue with Swift Playground 4.7 on my Mac, so this is not iPad specific.
Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"