NOUGAT 7.1.2 Easter Egg Problem

Hello, I have an issue trying to enable easter egg on Android 7.1.2. I click multiple times on "N", and when tiny ginger cat symbol appears down the screen I go to edit quick menu, but there is no new cat icon to add to quick list. Opening System UI and dessert case enables the Easter Egg, but from Marshmallow version. Please tell me what to do to enable cats game from Nougat.

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