Double click on "XRI Default Input Actions" in "Assets/Samples/XR Interaction Toolkit/2.4.3/Starter Assets"

If the wanted input action is not present, you can define a new one: select one action map, then in action, right click and choose « add action ». Choose a new name for the action, then do the binding with the controller: in the Binding, define the path. For Meta quest 2/3, choose « Oculus Touch Controller », then one of the button/trigger/touch of the controller

Open the script « SimulationManagerInteraction » in (Assets/Scripts/Gama Provider/Simulation)

Add a new variable «  [SerializeField] protected InputActionReference myButton = null; »

Define in the OtherUpdate method what will happens when this action is triggered

In the Scene, inspect the game object «Manager/Game Manager ». Give a value for the variable « My Button » - Click on the circle on the right of the field, and search the input action wanted (for example, the one created in step 1).