Quick change unity player setting build type from Mono to IL2CPP menu item "Help/Quick change build type/..."

QuickChangeBuildTypeMenu.cs

using UnityEditor;

public static class QuickChangeBuildTypeMenu
{
    private const int MENU_ITEM_PRIORITY = -1;
    private const string PATH_MENU_MONO = "Help/Quick change build type/Mono";
    private const string PATH_MENU_IL2CPP = "Help/Quick change build type/IL2CPP";

    private enum BuildType
    {
        Mono,
        IL2CPP
    }

    [MenuItem(PATH_MENU_MONO, true)]
    private static bool ValidateChangeToMonoBuildMenu()
    {
        bool shouldCheckedMenu = IsUseCurrentBuildType(BuildType.Mono);
        Menu.SetChecked(PATH_MENU_MONO, isChecked: shouldCheckedMenu);
        return true;
    }

    [MenuItem(PATH_MENU_IL2CPP, true)]
    private static bool ValidateChangeToIL2CPPBuildMenu()
    {
        bool shouldCheckedMenu = IsUseCurrentBuildType(BuildType.IL2CPP);
        Menu.SetChecked(PATH_MENU_IL2CPP, isChecked: shouldCheckedMenu);
        return true;
    }

    [MenuItem(PATH_MENU_MONO, false, MENU_ITEM_PRIORITY)]
    private static void ChangeToMonoBuildMenu()
    {
        ChangeBuildType(BuildType.Mono);
    }

    [MenuItem(PATH_MENU_IL2CPP, false, MENU_ITEM_PRIORITY)]
    private static void ChangeToIL2CPPBuildMenu()
    {
        ChangeBuildType(BuildType.IL2CPP);
    }

    private static void ChangeBuildType(BuildType buildType)
    {
        BuildTargetGroup currentBuildTargetGroup = EditorUserBuildSettings.selectedBuildTargetGroup;

        switch (buildType)
        {
            case BuildType.Mono:
            {
                PlayerSettings.SetScriptingBackend(currentBuildTargetGroup, ScriptingImplementation.Mono2x);
                PlayerSettings.SetManagedStrippingLevel(currentBuildTargetGroup, ManagedStrippingLevel.Disabled);
                AssetDatabase.SaveAssets();
            }
            break;

            case BuildType.IL2CPP:
            {
                PlayerSettings.SetScriptingBackend(currentBuildTargetGroup, ScriptingImplementation.IL2CPP);
                PlayerSettings.SetManagedStrippingLevel(currentBuildTargetGroup, ManagedStrippingLevel.Minimal);
                AssetDatabase.SaveAssets();
            }
            break;
        }
    }

    private static bool IsUseCurrentBuildType(BuildType buildType)
    {
        BuildTargetGroup currentBuildTargetGroup = EditorUserBuildSettings.selectedBuildTargetGroup;
        ScriptingImplementation currentScriptingImplementation = PlayerSettings.GetScriptingBackend(currentBuildTargetGroup);

        return buildType switch
        {
            BuildType.Mono => (currentScriptingImplementation == ScriptingImplementation.Mono2x),
            BuildType.IL2CPP => (currentScriptingImplementation == ScriptingImplementation.IL2CPP),
            _ => false
        };
    }
}