Very simple suggestion:
In Word, when using CWYW, when you hit ‘Go to EndNote’ you to to the open library in whatever state you last left it.
My suggestion is to be able to have the cursor on a citation in the document and then to have the ‘go to endnote’ button or a dedicated ‘go to selected citation button’ take you to the library automatically selecting the reference you were on.
This is similar to how if you are ‘on’ a particular reference and you hit ‘Edit Manage Citation’ it will open the list at that particular reference.