How to disable head rotation left/right but keep up/down in ALS (Advanced Locomotion System) UE 5.5?

Development Character & Animation
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Currently, the head in ALS v4 (UE 5.5) rotates left/right (yaw) and up/down (pitch) along with the camera movement. I want to block only the head’s side-to-side rotation (yaw), so the head moves only vertically (up/down), while when turning the camera left/right, the whole body rotates — similar to how it works in Lethal Company.

Questions:

  • Where in the Blueprints or Animation Graph is the head yaw/pitch controlled?
  • How can I block only the head’s yaw?
  • Do I need to edit a bone modifier, aim offset, or something else?

Thanks for the help! :folded_hands: