HighGroundRoyaleNetcode/Assets/Scripts/Gameplay/WarningPanel.cs

using Unity.Netcode;
using UnityEngine;
using System.Collections;


public class WarningPanel : NetworkBehaviour
{
    public static WarningPanel Instance { get; private set; }

    [SerializeField] private GameObject panel;

    private void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else
        {
            Destroy(gameObject);
        }
    }

    public void ShowPanelForTime(float seconds)
    {
        if (IsServer) // Only the server should trigger this
        {
            ShowPanelClientRpc(seconds);
        }
    }

    [ClientRpc]
    private void ShowPanelClientRpc(float seconds)
    {
        panel.SetActive(true);
        StartCoroutine(HidePanelAfterTime(seconds));
    }

    private IEnumerator HidePanelAfterTime(float seconds)
    {
        yield return new WaitForSeconds(seconds);
        panel.SetActive(false);
    }
}