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I have always played MTG in companion mode in the printable version since I learned a year ago. A few days ago I downloaded the MTG Arena app. I knew after downloading all the game modes and starting the color event that I could change the game mode by consulting this link:
https://mtgarena-support.wizards.com/hc/fr/articles/360056580532-Autres-modes-de-jeu-sur-mobile

So, I deleted the app then reinstalled it and created a new account.
However, companion play mode doesn't seem to be possible.

Also, it seems that it is not possible to import my deck list from the "ManaBox" application because of the deck style. (see attached screenshot)

I think many players would appreciate being able to play this game mode like the printed version.