In each game you may only use one Focus along with the Basic Focus. Select which focus you’d like to use on the New Game screen by pressing on the green box under the hero. This cycles through the available focuses (healing, combat, dungeon, etc.) until you’ve settled on which one you’d like to use! Or you can right click (double tap on mobile) to bring up the full checklist and select the focus there. Your focus is set at the start of the game and cannot be changed until after you’ve ended the current game.