It depends how that selection is done. If an AI prompts a human with 10 layouts it generates and the human picks ones, it is not copyrightable.

If the human takes some number of individually generated components and composes them in some creative way, the composition is copyrightable but the individual components are not.

One existing precedent was the layout of a graphic novel consisting AI generated panels. The layout was done by a human and protected by copyright. The content of each individual panel was generated by AI and was not. https://www.copyright.gov/docs/zarya-of-the-dawn.pdf

Code is no different. If AI generates a library and GUI, neither are copyrightable. If a dev glues them together, the expressiveness of that work may be, but it also might be the logical application of attaching interfaces and not creative enough to meet the threshold.

The 2024 opinion reinforces that determination.