I have finally been able to put MusicBee in track mode. However:
1. I have a fully locked tab open with a list of tracks
2. I type a word to search for in the top right search box
3. On one of the results, I right-click and do a search for artist
4. A new tab pops open listing all songs for that artist ALSO matching that word
Now, the above would be fine if the word I typed would still be visible in the search box so I could clear it and view all songs by that artist, but I can't. The search box appears and behaves as if nothing was searched for, and the tab title does the same (a title, btw, which resets to just a generic "search result" when you switch away from it and back after a few times).