Set Link View to Same Level
Show data (in the editor) that corresponds to the window with key focus. You can have multiple editor windows open. Not clear when I would want my editors to all show the same information, but that’s the default — content.
Same Level: When selected, the editor window always displays the same contents as the window with key focus, and updates whenever the window with key focus changes. For example, if the Score Editor has key focus, in Same Level Link mode, the Event List displays the same data as the Score Editor (numerically, of course).