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

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?

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 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