I've been DYING to know can Aliza use the battle screen like a monster can as in can she cast attacks in the battle screen (I don't know the terminology for it but I hope you know what I mean)

She can ^^ but she doesn’t ever get the chance to. The monsters don’t bother with it anymore. The battle screen is formal, and for monsters in more civilized times, it ensured everyone played by the rules.

They don’t care about fairness anymore.