Your VR controllers will be shown in the VR environments if they are detected and tracking. The appearance will match the actual controllers used (for HTC Vive, Oculus Rift, Oculus Rift S, Windows Mixed Reality and Valve Index controllers).
The only two buttons that are needed for KeyVR are the menu button and the trigger button.
The menu button launches the menu and the trigger enables you to handle the objects and switch between different appearances.
Menu button Menu and navigation in the scene Navigation in the scene Trigger button
To launch the menu, press and hold the Menu button, move the controller to the desired mode/state and release the Menu button to select a mode or toggle a state.
Set the mode for the controller by selecting one of the top six items in the menu. The choice only applies to the controller from where the menu was launched - this allows you to e.g. select materials with one hand while the other can move objects.