Better EditorFoldout for Unity's Editor! Allows the user to click the foldout text as well as the arrow to toggle the foldout.

EditorFoldout.cs

// ------------------------------------------ //
// Author : William Whitehouse / WSWhitehouse //
// GitHub : github.com/WSWhitehouse           //
// Date   : 27/06/2019                        //
// ------------------------------------------ //

using UnityEditor;
using UnityEngine;

public static class EditorFoldout
{
    public static bool Foldout(bool foldout, GUIContent content, GUIStyle style = null, bool toggleOnLabelClick = true)
    {
        if (style == null)
            style = EditorStyles.foldout;
        
        Rect position = GUILayoutUtility.GetRect(40f, 40f, 16f, 16f, style);
        
        return EditorGUI.Foldout(position, foldout, content, toggleOnLabelClick, style);
    }

    public static bool Foldout(bool foldout, string content, GUIStyle style = null, bool toggleOnLabelClick = true)
    {
        return Foldout(foldout, new GUIContent(content), style, toggleOnLabelClick);
    }
}

Unity's Foldout:

foldoutBool = EditorGUILayout.Foldout(foldoutBool, new GUIContent("Foldout Test"));

New EditorFoldout:

foldoutBool = EditorFoldout.Foldout(foldoutBool, new GUIContent("Foldout Test"));