test/Assets/PerfectWorld/Scripts/UI/SkillUI/SkillUI.cs

using System;
using UnityEngine;
using UnityEngine.UI;

namespace BrewMonster
{
    public class SkillUI : MonoBehaviour
    {
        [SerializeField] private Button skillButton;
        [SerializeField] private Button actionButton;
        [SerializeField] private Button learnedSkillButton;
        [SerializeField] private GameObject skillUIPanel;
        [SerializeField] private GameObject actionUIPanel;
        [SerializeField] private GameObject learnSkillUIPanel;

        private void Awake()
        {
            skillButton.onClick.RemoveAllListeners();
            actionButton.onClick.RemoveAllListeners();
            learnedSkillButton.onClick.RemoveAllListeners();
            skillButton.onClick.AddListener(OnSkillButtonClicked);
            actionButton.onClick.AddListener(OnActionButtonClicked);
            learnedSkillButton.onClick.AddListener(OnLearnedSkillButtonClicked);
        }

        private void OnLearnedSkillButtonClicked()
        {
            skillUIPanel.SetActive(false);
            actionUIPanel.SetActive(false);
            learnSkillUIPanel.SetActive(true);
        }

        private void OnActionButtonClicked()
        {
            skillUIPanel.SetActive(false);
            actionUIPanel.SetActive(true);
            learnSkillUIPanel.SetActive(false);
        }

        private void OnSkillButtonClicked()
        {
            skillUIPanel.SetActive(true);
            actionUIPanel.SetActive(false);
            learnSkillUIPanel.SetActive(false);
        }
    }
}