This is a very simple extension of MonoBehaviour I use in every Unity project. Every panel class in my games extend this class, allowing for a common interface across all panels.

GamePanel.cs

using UnityEngine;

namespace Bretblack.Games.GUI
{
    public class GamePanel : MonoBehaviour
    {
        public virtual void SetActive(bool b)
        {
            gameObject.SetActive(b);
        }
        
        public virtual void OpenPanel()
        {
            gameObject.SetActive(true);
        }

        public virtual void ClosePanel()
        {
            gameObject.SetActive(false);
        }
    }
}