Xcode – Can't see Dynamic Type slider in the Canvas Device Settings

I'm working through Apple's SwiftUI tutorials. At one point it says:

Experiment – Adjust the Dynamic Type slider in the Canvas Device Settings

The Canvas Device Settings pop-up in Xcode doesn't show the Dynamic Type slider:

How can I make the Dynamic Type slider visible ?

Xcode – Can't see Dynamic Type slider in the Canvas Device Settings
 
 
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