using UnityEngine;
using AdvancedPeopleSystem;

public class DemoScript : MonoBehaviour
{
    public CharacterCustomization character;

    private void Update()
    {
        if (Input.GetKeyDown(KeyCode.Q))
        {
            character.SetHeight(Random.Range(-0.2f, 0.2f));
        }
    }
}

Press Q to change character height

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