It has always worked this way and is not a toggle.  If you delete the Viewer window via the "x" in the upper right hand corner and then use the Window pulldown, you will see "Show Viewer" is no longer checked ON.  The purpose of the pulldown option is to get the Viewer window back when you accidentally killed it.   Show Overlays works differently.

On Thu, Oct 29, 2020 at 5:01 PM Andrew Randrianasulu via Cin <cin@lists.cinelerra-gg.org> wrote:
Sorry, not sure if this is local issue or something like real bug (so late again ...)

I started Cin even with english language, and still I only can, say, toggle 'Show viewer' window ON via this menu, but can not hide it again by clicking on same menu item again. I can hide/activate 'Show overlays' window, but apparently this is only one reacting this way ...

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