Thanks for pointing that out. I thought I looked but apparently not close enough. This program and its support documentation (not to mention the forum) is really evolving into something very elegant!
I just realized, after all these years, that the tag panel could be horizontal. Perhaps a mention of this here would be helpful.
@Florian I don’t know how you’re preparing this data in the backend, but would it be possible for you to use colspan where ID3v2.3 and 2.4 fields are identical?