DTK "My Mac (Designed for iPhone)" scheme

In a Xcode 12 beta 5 project on the DTK I see a "My Mac (Designed for iPad)" scheme in my iOS target. I'd like to run the app as an iPhone app on the DTK instead. How do I either add a "My Mac (Designed for iPhone)" scheme or edit the Designed for iPad scheme to iPhone?
DTK "My Mac (Designed for iPhone)" scheme
 
 
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