Editor Window Snippet or Automatic Completion is not working?

My all auto completion with snippets is working with scriptable object and plane class so it is easy to debug. But when I start editor window autocompletion is not working. I will attach screenshot with editor window that it does not show any error when I do not write using UnityEditor. I am using Unity2020.1.3f1. I installed most of snippets and installed .NET5 also. Anyone can please! Screenshot (13)|690x388 help me.

It’s possible that the auto complete in VS Code isn’t recognizing it as Unity code since it’s in the Editor assembly and not the main code assembly. (Everything in the Editor folders is actually put in a different assembly, and sometimes that plays havoc with intellisense).

Thank you very much for your response.