I submitted a bug report to Apple using the Feedback Assistant (FB17019201) for this issue. I also submitted a code-level support request for this issue and was told engineering had identified the issue. In my opinion, Apple should address the issue or change the documentation. “It automatically builds a universal binary for the release version of your code." https://developer.apple.com/documentation/apple-silicon/building-a-universal-macos-binary

Just downloaded Xcode 16, and it only has inline comparison on commit. Side by side comparison on commit is still missing. I submitted a report to Apple using Feedback Assistant in November 2023 on this issue. FB13361494 Xcode 15 Inline UI Commit. My report has been closed with no recent similar reports. Either I am the only Apple developer in the world to have submitted feedback on this issue, my feedback was horribly written, or someone at Apple dropped the ball.

I agree, the Xcode 15 inline comparison on commit is unusable. I submitted a bug report using Feedback Assistant about 2-1/2 months ago on this issue. I received no response so I closed the issue. Does anyone know how to get the attention of any developers on the Apple Xcode team?

Using Xcode 14.3 and I have not seen this issue. I have seen other issues with Nib files but not that one.