I found a solution.
I am going to explain my solution if other people have the same problem.
- In picard go to Options → Scripting
- Check Enable Tagger Script(s)
- Click “Add new tagger script”
- Add the following script:
$setmulti(albumartist,%_albumartists%)
$setmulti(albumartistsort,%_albumartists_sort%)
$setmulti(artist,%artists%)
$setmulti(artistsort,%_artists_sort%)
5. Save the changes with “Make It So!”
Now the Artists page looks like this for me:
