The news article: http://worldoftanks.eu/news/general-news/frontline-2023-2/ says that “Frontline … Episode 2 … comes with an additional Combat Reserves Level, a new battle scenario, Twist of Fate …”

It then specifies that “The addition of a fourth Level to Combat Reserves is only for the Twist of Fate experimental scenario.”

How do I enable/select/unlock (not sure the correct term) this “Twist of Fate experimental scenario”, I am confused. I select the FL mode, but don’t see where it is located or how to “choose” it