Show documentation window crashes XCode 12

The Xcode on the app store is some sort of unknown version, (Since there it release even before the GM version available). So get rid of it and Download The Xcode From The developer.apple.com or click the proper version below. Then it. will work like a charm.

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_{Don't forget to remove the appstore version downloaded Xcode}

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Direct Download

Xcode 12

Xcode 12.2 Beta

Update: There's now a new version (12.0.1) in the App Store that fixes this issue.

I'm experiencing the same when using the version from the App Store. People in this Apple Forums thread are reporting that it doesn't occur with the GM download from Apple's developer resources, despite the build identifiers being exactly the same.

Anecdotally, I can confirm that I was able to use documentation in the GM version before I deleted it in favor of the App Store version. So this may in fact be a viable workaround until the App Store version is fixed.