This works for multi-site.
Edit file: wp-includes/js/mediaelement/wp-mediaelement.css
Use F3 search function in text editor mode and find: wp-playlist-current-item
The default height shown is 60px.
Change it to 150px
Also change ????
}
.wp-playlist-current-item .wp-playlist-item-title,
(ADDED) .wp-playlist-current-item .wp-playlist-item-album,
.wp-playlist-current-item .wp-playlist-item-artist {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
(ADDED) padding: 10px;
(ADDED) font-weight: bold;
}