Do you have a value in DISPLAY ARTIST on any one of your songs that you cannot see when you display <artist> as a tag anywhere in MusicBee?
That depends on the location.
For the main panel and the track information panel it will display an actual <Display Artist> tag when using Artist.
But when using Artist in the column browser, a physical Display Artist tag will not show up.
(if you use a virtual tag: <Artist>, and select that one for the Column Browser it will)
Obviously there is some clever stuff going on why and where MusicBee displays artist and display artist, and it is working well in practice.
But if you want full control over this stuff when using a virtual tag it's a bit difficult, since <Artist> will deliver dynamic results depending on the existence of an actual Display Artist tag.
So you can't be sure if it was sourced from an actual Display Artist tag, or an internal 'virtual' Display Artist tag.
That's why I think it would be good if we had access to a tag that will display a physical Display Artist tag, and will remain blank if it doesn't exist.
But maybe that's just me, and nobody else would ever use that?
I also think I owe you a second apology for leading you on some wrong trail.
I have several testing installs of MusicBee on my computer, and for at least one of them I have created a custom tag for Display Artist. (because I am using Picard for creating and populating it)
It looks like I was wrong when I said that Display Artist will show up in the Tag Inspector's drop-down menu.
It will for my installs, but I think it probably doesn't for clean installs.
Perhaps it should?
Since MusicBee can create it by itself, we should be able to also?