Ty_B

Don't be embarrassed. Not intuitive to me, either. I can't think of another application on a Mac that behaves that way (where clicking the dock icon opens a new window). What adds to the confusion is when the most recent window you had up was expanded to hide the sidebar ... it seems that you're just opening a note and it's easy to forget that you actually have a proper Evernote "window" (not just a note) open.