Thanks all for your quick replies! Sorry Dave-in-Decatur, that wasn't the problem. I couldn't answer your question because it was the first time that I've opened Evernote in a long time. The problem was solved by the suggestion from DTLow -- once I opened the Note List view, I could see all the notes associated with the tag. Mind you, this is very different from what I saw in videos, but that's the world now. CalS, thanks for responding and affirming the solution.
Blessings!