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Welcome back to the King Community 🥰
Actually every feature of the game is controlled by the test group and the control is in a completely random process which cannot be manually modified or managed.
We're very sorry because you lost the ad viewing feature but not that you lost the feature forever. Since it is a random process you can find it again in your game at any time although it is not possible to say for sure when you will find it and you can find out more about this HERE.
Thank you.