Remove left side tint in the Unity hierarchy window

RemoveDefaultBG.cs

using UnityEditor;
using UnityEngine;

namespace EnhancedHierarchy {
    [InitializeOnLoad]
    static class RemoveDefaultBG {
        static RemoveDefaultBG() {
            After.Frames(1, () => {
                var s = ReflectionHelper.FindType("UnityEditor.SceneVisibilityHierarchyGUI");
                var t = s.GetNestedType("Styles", ReflectionHelper.FULL_BINDING);

                t.SetStaticField("backgroundColor", Color.clear);
            });
        }
    }
}