no result displayed for each instruction

I use the "introduction to apps development using Swift "ebook, I use as indicated Xcode 9 and the different files associaated with the book : with the "03_Chaînes" file, the results associated with each instruction don't appear anyumore on the right of the window, while there is the metion ""Running 03_Chaînes" appearing on the top of the window

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There is somme improvement : I have quitted and relaunched Xcide 9 and opered again the first lesson, "01_BasesAiresDeJeux.playground", the results appeared again on the right of the screen, and opening "04_BonjourLeMonde", I found more explanatoins about this problem, but I didn't succeded to make disappear this vertical area, strengthening it has a limit, and I still don't understand how I unwillingly hided this area...

Elsewhere, I understand that the console sub window is a more used tool by programers, so I'll definitely concentrate on this console area