Moving multiple controllers at once

[_Aka_]

Thanks for the tips about windows 10. This will indeed be the first time I install Windows 10 on my computer.

I believe that to get OnSelectionChange executed you have to open the window first, and only then it will executed when the selection is updated. In this link you will find an example of how to open a window
https://docs.unity3d.com/ScriptReference/EditorWindow.OnSelectionChange.html