How to change Simulator Test Parallelization in Xcode on XCode13

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Within XCode 13 > Preferences > General, I am trying to change the number of Simulators to be used for my tests. It keeps resetting it back to Auto once I switch tabs or close the dialog and come back. I tried rebooting my machine and trying again but it is still resetting it after I adjust it.

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xcode13 apple-m1 ios-simulator ios
1 Answers

A workaround: Quit XCode. In ~/Library/Preferences, there is a file called "com.apple.dt.Xcode.plist". You can edit the values for the following two Keys: IDEMaxParallelTestingWorkersMac, IDEMaxParallelTestingSimulators. Restart XCode.

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