Sideboarding on Mobile
I have had issues with sideboarding on my Android phone. There are two specific issues I would like to mention. First, when building my deck for games 2 and 3, the deck name, mana curve graph, and deck size tracker are replaced by a dropdown menu from which you can choose "Option A", "Option B", or "Option C". These do absolutely nothing helpful to my knowledge, and they block the actually useful features. Right now I have to continually count the number of cards in my sideboard to see how many I have to add or take out. The second major issue is that the sideboard timer bar blocks the player from being able to view cards in the opponent's graveyard or exile zones, or revealed cards in their hand or library. Like the first issue, this is not a problem on pc.

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Flamennight#89286 commented
Having same issue described on mobile (Android), as well as continullay not being able to sideboard at all. Sometimes the cards will flash like I clicked them, but will not add. I can remove cards, but can never actually add cards, forcing me to wait out the timer if I ever remove anything
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Fighter Hayabusa#66209 commented
Same experience as OP, makes sideboarding a nightmare.
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CannedHeat#84216 commented
This obvious and glaring UI mistake (option A, B, C instead of the vital deck card count element which exists on the Windows version) has existed for so long, and makes sideboarding on Android in ANY FORMAT so difficult, it's truly unbelievable.
Option A/B/C is not even Arena functionality, this looks like incomplete work in the initial Android UI implementation. Please finish the interface after 2 years!!!
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gregori128#03999 commented
I am experiencing the same issues as OP, and to be frank this renders playing best of 3 on mobile to be a completely unplayable experience. I DO NOT WANT OPTION A AND C I WANT TO SEE HOW MANY CARDS ARE IN MY DECK WHILE MAKING SIDEBOARDING DECISIONS