I just wondered if the word "Disc" could be removed from the way it displays like it used to be - if that's not possible, I can live with it.
Maybe another user has a suggestion.
I am guessing chances the developer will revert any handling of this are very slim.
But I think you may be over-estimating the effort it would take to correct this mistake. (I'm sorry, but it is)
And, you will be closing the possibility to ever update MusicBee again, and you'll run into problems as soon as you want to use providers such as MusicBrainz that can provide you with disc subtitle data without you having the need to type anything yourself.
But obviously it's your prerogative.