Expose Private Field in Custom Editor

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Another hot tip is make the class partial so your editor script can be in a different file.

      // in file named Foo.cs
      public partial class Foo : MonoBehaviour
      {
          private int bar;
      }
      
     // in a different file name Foo.Editor.cs
     public partial class Foo
     {
      [CustomEditor(typeof(Foo))]
        public class FooEditor: Editor
        {
          public override void OnInspectorGUI()
          {
            var script = (Foo)target;
      
            script.bar = EditorGUILayout.IntField("Bar:", script.bar);
          }
        }
     }