Other components of the XR Manager are:
Hand Followers include input, canvas, and grabber code and are covered in a separate section. The Head Follower includes a script to simply match the Camera to the Player Head, and the Basic IK Solver is a simplified IK script (Inverse Kinematics) which is included for those do not wish to use VRIK from the Final IK Asset (from RootMotion). Line Rendering code is also attached and is also covered separately.
The Basic IK Solver is automatically configured, but can be done manually but unchecking the Auto Config check box in each section. However, the Auto Configure has been built to work in the majority of motions, and an has Active/Inactive feature (controlled by Actions) for when canned animations are needed.