There is a .xib file. I recall editing the interface a few months ago but don't seem able to do it now after a few upgrades. CocoaSlideShow was from Github. I downloaded a zip of the CocoaSlideShow code from GitHub. The first time I viewed it with XCode (12.3.(12C33)) I could see the interface. After closing and re-opening I could not see it.
Topic:
Developer Tools & Services
SubTopic:
Xcode
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