How to show an any file by assistant editor

Xcode with 27 inch display / iPhone App Development Memo
↑Here I told that I liked to use the assistant editor.
But I didn’t know how to show an any file there.

You usually select a file name to show in the added right area at this top area of assistant editor, but Xcode sometimes does not show only one file in the 'Manual" like this:

Assistant editor

So I wanted to know how to show an any file and found it.
Just push option and select a file you want to show in the assistant editor.
Xcode would show the file even if the assistant editor was hidden.

Nothing happened? Then you might have changed the settings.
You can see it at Preferences / Navigation :
Xcode / Preferences / Navigation
You can change the settings when you click a file with option key etc..
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