Choosing weapon for you hero

As fas as I can tell the old way of choosing weapon for you hero is gone in favour of the new improved troop setup interface (love it btw). But s far as I can tell the old weapon selection is still used for arena. Is there any way to select what weapon you use in arena?

Thanks for the link, but I still don’t see how you actually switch the weapon for arena. Am I missing something?

Just click your hero before starting the battle, weapon selection will pop-up.

You just have to click on the weapon in the Arena to go to the Weapon tab. Like before in fact, that didn’t change.