Toggling assistant editor layout in Xcode 11

Sometimes the assistant editor layout appears disabled in Xcode 11. E.g. zxmfO

Does anyone know how to toggle this setting?

This topic for Apple only. Doesn't involve Swift itself. Apple Developer forums or StackOverFlow are your friends.

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Thanks for your reply.

Yes, it is. The category describes,

This area is intended for users to get help with or ask questions about Swift or its related tools

Let me try ADF then.

Xcode is not a related Swift tool. It is a general IDE for Apple developers that handles just about everything (Swift, C,C++,Objective-C, Objective-C++, and through clever use of scripts, Fortran, Ada, Python, Ruby, etc..).