I have a 2in1 mkv , 2 editions of the same movie in one mkv, one edition is 90 minutes long, the other is 120 minutes. I can select between them in a player, but in mkvextractgui I only see a video track, an audio track and a chapters track. How do I extract one edition of the movie ?

Thank you for the answer and please redirect me if this has been discussed, I searched for "mkv 2in1" and found nothing.