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The shader:

Shader "Standard"
{
 Properties
 
 [LM_Albedo] [LM_Transparency] _Color("Color", Color) = (1,1,1,1) 
 [LM_MasterTilingOffset] [LM_Albedo] _MainTex("Albedo", 2D) = "white" 

 [LM_TransparencyCutOff] _AlphaTestRef("Alpha Cutoff", Range(0.0, 1.0)) = 0.5

 [LM_Glossiness] _Glossiness("Smoothness", Range(0.0, 1.0)) = 0.0
 [LM_Metallic] _Metallic("Metallic", Range(0.0, 1.0)) = 0.0
 [LM_Metallic] [LM_Glossiness] _MetallicGlossMap("Metallic", 2D) = "white" 

 _BumpScale("Scale", Float) = 1.0
 [LM_NormalMap] _BumpMap("Normal Map", 2D) = "bump" 

 _Parallax ("Height Scale", Range (0.005, 0.08)) = 0.02
 _ParallaxMap ("Height Map", 2D) = "black" 

 _OcclusionStrength("Strength", Range(0.0, 1.0)) = 1.0
 _OcclusionMap("Occlusion", 2D) = "white" 

 [LM_Emission] _EmissionColor("Color", Color) = (0,0,0)
 [LM_Emission] _EmissionMap("Emission", 2D) = "white" 

 _DetailMask("Detail Mask", 2D) = "white" 

 _DetailAlbedoMap("Detail Albedo x2", 2D) = "grey" 
 _DetailNormalMapScale("Scale", Float) = 1.0
 _DetailNormalMap("Normal Map", 2D) = "bump" 

 [KeywordEnum(UV1, UV2)] _UVSec ("UV Set for secondary textures", Float) = 0

 // UI-only data
 [KeywordEnum(None, Realtime, Baked)] _Lightmapping ("GI", Int) = 1
 [HideInInspector] _EmissionScaleUI("Scale", Float) = 1.0
 [HideInInspector] _EmissionColorUI("Color", Color) = (0,0,0)
 [HideInInspector] _EmissionColorWithMapUI("Color", Color) = (1,1,1)

 // Blending state
 [HideInInspector] _Mode ("__mode", Float) = 0.0
 [HideInInspector] _SrcBlend ("__src", Float) = 1.0
 [HideInInspector] _DstBlend ("__dst", Float) = 0.0
 [HideInInspector] _ZWrite ("__zw", Float) = 1.0
 

It have 4 modes: Opaque, Cutout, Fade, Transparent
I want to switch between this 4 modes and affecting the specific gameobject shader rendering modes in the hierarchy using a button.

Each click on the button will switch to the next mode.

And in EditorWindow

The script:

using System.Collections;
using System.Collections.Generic;
using UnityEditor;
using UnityEngine;

public class ChangeShaderRenderingModes : EditorWindow

 public enum BlendMode
 
 Opaque,
 Cutout,
 Fade,
 Transparent
 

 [MenuItem("Tools/Change Rendering Modes")]
 public static void ShowWindow()
 
 GetWindow<ChangeShaderRenderingModes>("ChangeRenderingModes");
 

 private void OnGUI()
 
 if(GUI.Button(new Rect(50,50,50,50), "Switch Mode"))
 
 var objects = Selection.objects;
 
 

I'm not sure how to make the switching and accessing the shader parameters.