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Update 2017 April 9th:
Apple has just upgraded Xcode to version 8.3.2. ERROR IN THE PROGRAM FIXED! Enjoy the coding!
Update 2017 April 9th:
Apple has just updated Xcode to version 8.3.1. Not yet fixed this error.
Update 2017 April 4th:
Thanks @Aamir for submitting the bug report. Wait for an answer.
Update 2017 March 31st:
This error appears in the latest version of Xcode 8.3.
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Today I have a new Mac. In the old days, I double-click on a group in the left tree view, the groups expand.


A new window opens on my new Mac. Does anyone know where to configure this?

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