I want to get a bubble window in Editor

9470372--1330964--upload_2023-11-14_18-10-48.png
I want to customize this grey bubble effect in Editor,but i dont konw method,Thank you.

It could be this one:
https://docs.unity3d.com/ScriptReference/EditorWindow.ShowNotification.html

You can also take a look in the Unity CSReference github repository
https://github.com/Unity-Technologies/UnityCsReference/blob/d0e1a5b25e8d3c8e1b4e6baf0073032d97254a0c/Editor/Mono/SceneView/SceneView.cs#L4164

That’s the way.Thank you.