Major_Project_A/Assets/Scripts/UI/LeadPlayerUI.cs

using System.Linq;
using UnityEngine;
using UnityEngine.UI;
using Networking.Server;

public class LeadPlayerUI : MonoBehaviour
{
    [SerializeField]
    private ClientList Clients;

    [SerializeField]
    private TMPro.TextMeshProUGUI ScoreText;

    [SerializeField]
    private Image ColorImage;

    private void Awake()
    {
        UpdateScore();
    }

    public void UpdateScore()
    {
        if (Clients.Count() == 0)
        {
            ScoreText.gameObject.SetActive(false);
            ColorImage.gameObject.SetActive(false);
            return;
        }
        else
        {
            ScoreText.gameObject.SetActive(true);
            ColorImage.gameObject.SetActive(true);
        }

        ClientData lead = Clients.maxBy(p => p.Lives);
        ScoreText.text = lead.Lives.ToString();
        ColorImage.color = lead.Color;
    }
}