RendererSwitcher.cs

using UnityEngine;
using UnityEngine.Rendering.Universal;

public class RendererSwitcher : MonoBehaviour
{
    [Tooltip("Index of the renderer in the URP Pipeline Asset Renderer List")]
    public int forwardRendererIndex = 0;
    public int deferredRendererIndex = 1;

    private UniversalAdditionalCameraData camData;

    void Start()
    {
        // Get the main camera's UniversalAdditionalCameraData
        Camera cam = Camera.main;
        if (cam != null)
        {
            camData = cam.GetComponent<UniversalAdditionalCameraData>();
            if (camData == null)
            {
                camData = cam.gameObject.AddComponent<UniversalAdditionalCameraData>();
            }
        }
    }

    public void SwitchToForward()
    {
        if (camData != null)
        {
            camData.SetRenderer(forwardRendererIndex);
            Debug.Log("Switched to Forward Renderer");
        }
    }

    public void SwitchToDeferred()
    {
        if (camData != null)
        {
            camData.SetRenderer(deferredRendererIndex);
            Debug.Log("Switched to Deferred Renderer");
        }
    }
}