How to change{ battle}arena team setup?

It’s seems that the system picking its own 4 characters to fight in the arena.
How can you change it?
Thanks

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I would love to know this too

@Itamar In Battle Mode, you lead a party of 4 heroes randomly selected from your roster into an arena to battle another player’s group of random heroes.

so, it meens that you must drive all your characters level-up. Not fair play.
So if I don’t whant to use the cleric (5th character)… what can I do to avoid it ?