UPDATES: Please allow the instructional window regarding backend modifications when it appears. Enabling the backend setting for the new FSPC import is essential for the proper functioning of the FSP Controller.
It will close and reopen your unity file > Import StarterAssets
https://assetstore.unity.com/packages/essentials/starterassets-firstperson-updates-in-new-charactercontroller-pac-196525
A Video of This fps C Asset Details https://youtu.be/PbfktZQMKCQ?si=9sJmmFDsorzLxcHT
In Hierarchy, go select the below 3 objects and COPY
Go back to the MAIN SCENE (Your scene) > Past the copied Camera and FSPC objects
Replace the existing FPSC with the new one.
Go to Hierarchy and select This MainCamera
on the Inspector > Rendering > Check Post Processing