Using Xcode Beta 4, you had to set the following 2 configuration changes in order to have VisionOS Simulator appear in the list of Run Destinations. All were in the Build settings, Deployment section.
Target Device Families: Select Other, and add #7 to the list. This will provide support to Apple Vision
iOS Deployment Target: Set to iOS 18.0
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Developer Tools & Services
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Xcode
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