Winning probability of a game is also known as Payout. In order to check payout of the specific game, please open the game screen frist.
If you play Live Casino games, click the "Help" icon at the top-right side of the game screen and choose "Payouts" at the right hand side menu.
If you play Casino games, click on the menu button at the top-right side of the game screen. Click on "PAYTABLE" in order to check payouts of the selected game.